Common use of Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities Clause in Contracts

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRC’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRC’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRC’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRC’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC CCI as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCCCI’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCCCI’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCCCI’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCCCI’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC CCI shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC <customer_short_name> as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRC<customer_short_name>’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRC<customer_short_name>’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRC<customer_short_name>’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRC<customer_short_name>’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC <customer_short_name> shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC PLI as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCPLI’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCPLI’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCPLI’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCPLI’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC PLI shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC AFN as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCAFN’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCAFN’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCAFN’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCAFN’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC AFN shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC ITC^DeltaCom as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.11.4.1 below. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCITC^DeltaCom’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 twenty-four thousand (24,000) or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") Intial Wire Center List is available on set forth in Exhibit D hereto or as modified by a subsequent notification via BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx’s web site. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCITC^DeltaCom’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 above shall be as set forth in Exhibit B and the rates for MRCITC^DeltaCom’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 above shall be as set forth in Exhibit A.A. On or after December 1, 2005, BellSouth shall xxxx to ITC^DeltaCom the amount owed for the Embedded Base of Dark Fiber Transport and the Embedded Base of Dark Fiber Transport Entrance Facilities for the period from March 11, 2005 to the Effective Date, and ITC^DeltaCom shall pay such amount according to payment processes set forth in Attachment 6 of this Agreement. 6.9.1.7 The Transition Period shall apply only to MRCITC^DeltaCom’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC ITC^DeltaCom shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment above and as set forth in Section 6.9.1.10 below. Further, MRC ITC^DeltaCom shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4 above, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC ITC^DeltaCom shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.61.6 above. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC ITC^DeltaCom fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC CBX One-Stop as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCCBX One-Stop’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCCBX One-Stop’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCCBX One-Stop’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCCBX One-Stop’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC CBX One-Stop shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Aero as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCAero’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCAero’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCAero’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCAero’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Aero shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC Aero shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC Aero shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC Aero fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC NationNET as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCNationNET’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCNationNET’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCNationNET’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCNationNET’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC NationNET shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-self- certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC NationNET shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC NationNET shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC NationNET fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC GSC as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCGSC’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCGSC’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCGSC’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCGSC’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC GSC shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC GSC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC GSC shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC GSC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC ProNet as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCProNet’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCProNet’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCProNet’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCProNet’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC ProNet shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Starlink as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCStarlink’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCStarlink’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCStarlink’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCStarlink’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Starlink shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Excel PCHP as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCExcel PCHP’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCExcel PCHP’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCExcel PCHP’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCExcel PCHP’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Excel PCHP shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 5.9.1.1 For purposes of this Section 6.95.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 5.9.1.2 For purposes of this Section 6.95.9, Embedded Base means Dark Fiber Transport that was in service for MRC Deland Actel as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 5.9.1.3 For purposes of this Section 6.95.9, a Business Line is as defined in 47 C.F.R. § 51.5.. 5.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1.4 5.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 5.9 only for MRCDeland Actel’s Embedded Base during the Transition Period: 6.9.1.4.1 5.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during 5.9.1.5 During the Transition Period, the rates for MRCDeland Actel’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 5.9.1.1 shall be as set forth in Exhibit B and the rates for MRCDeland Actel’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 5.9.1 shall be as set forth in Exhibit A. 6.9.1.7 5.9.1.6 The Transition Period shall apply only to MRCDeland Actel’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Deland Actel shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities 5.9 pursuant to this Agreement. 6.9.1.8 5.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.45.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 5.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC NGTelecom as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCNGTelecom’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCNGTelecom’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCNGTelecom’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCNGTelecom’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC NGTelecom shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-self- certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC NGTelecom shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC NGTelecom shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC NGTelecom fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC FLATEL as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCFLATEL’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCFLATEL’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCFLATEL’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCFLATEL’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC FLATEL shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC FPB as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCFPB’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCFPB’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCFPB’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCFPB’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC FPB shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC <<customer_short_name>> as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRC<<customer_short_name>>’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRC<<customer_short_name>>’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRC<<customer_short_name>>’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRC<<customer_short_name>>’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC <<customer_short_name>> shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Cinergy as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCCinergy’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCCinergy’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCCinergy’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCCinergy’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Cinergy shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-self- certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC Cinergy shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC Cinergy shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC Cinergy fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 5.9.1.1 For purposes of this Section 6.95.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 5.9.1.2 For purposes of this Section 6.95.9, Embedded Base means Dark Fiber Transport that was in service for MRC DeltaCom as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.95.9. 1.4.11.4.1 below. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 5.9.1.3 For purposes of this Section 6.95.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 5.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 5.9 only for MRCDeltaCom’s Embedded Base during the Transition Period: 6.9.1.4.1 5.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 twenty-four thousand (24,000) or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting 5.9.1.5 This section left blank intentially by the criteria set forth in Section 6.9.1.4 above as of Parties. 5.9.1.6 Transition Period Pricing. From March 1011, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding through the Effective Date completion of this Agreement, during the Transition Period, the rates BellSouth shall charge a rate for MRCDeltaCom’s Embedded Base and Excess of Dark Fiber Transport as described in Section 6.9.1.2 and Embedded Base Dark Fiber Transport Entrance Facilities shall be equal to the higher of: 5.9.1.6.1 115% of the rate paid for that element on June 15, 2004; or 5.9.1.6.2 115% of a new rate the Commission establishes, if any, between June 16, 2004 and March 11, 2005. 5.9.1.6.3 These rates shall be as set forth in Exhibit B Attachment 2 of the Agreement and the rates for MRC’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in this Section 6.9.1 shall be as set forth in Exhibit A.5.9.1. 6.9.1.7 5.9.1.7 The Transition Period shall apply only to MRCDeltaCom’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC DeltaCom shall not add new Dark Fiber Transport as described in this Section 6.9 5.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment 1.9 above and as set forth in Section 6.9.1.10 5.9.1.10 below. Further, MRC DeltaCom shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 5.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.45.9.1.4 above, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 5.9.1.9 No later than June 10, 2006 MRC DeltaCom shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.61.6 above. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 5.9.1.9.1 If MRC DeltaCom fails to submit the spreadsheet(s) specified in Section 6.95.9.1.9 above for all of its Embedded Base prior to June 10, 2006 or by some other mutually agreed upon date, BellSouth will identify DeltaCom’s remaining Embedded Base, if any, and will transition such circuits to the equivalent tariffed BellSouth service(s). Those circuits identified and transitioned by BellSouth pursuant to this Section 5.9. 1.9.1 shall be subject to the applicable switch-as-is charges as set forth in this Agreement and, only where physical rearrangements are necessary, the full nonrecurring charges for installation of such BellSouth services as set forth in BellSouth’s tariffs shall apply to such circuits. 5.9.1.9.2 For Embedded Base circuits converted pursuant to Section 5.9.1.9 above or transitioned pursuant to Section 5.9.1.9.1 above, the applicable recurring tariff charge shall apply to each circuit as of September 11, 2006. 5.9.1.9.3 To the extent that DeltaCom no longer desires to provide a particular service, it must notify BellSouth of its intent to discontinue and the parties must coordinate the disconnect to take place prior the conclusion of the applicable transition period. DeltaCom must also adhere to Commission Rule R17-2(q) regarding the discontinuance of service to customers. 5.9.1.10 This section left blank intentially by the Parties.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC ONS as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCONS’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCONS’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCONS’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCONS’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC ONS shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Kinetix as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCKinetix’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCKinetix’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCKinetix’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCKinetix’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Kinetix shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-self- certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC Kinetix shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC Kinetix shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC Kinetix fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Seven Bridges as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCSeven Bridges’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCSeven Bridges’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCSeven Bridges’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCSeven Bridges’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Seven Bridges shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Nex-Phon as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCNex- Phon’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCNex-Phon’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCNex-Phon’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCNex-Phon’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Nex- Phon shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC BTI as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.11.4.1 below. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCBTI’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 twenty-four thousand (24,000) or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") Intial Wire Center List is available on set forth in Exhibit C hereto or as modified by a subsequent notification via BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx’s web site. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCBTI’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 above shall be as set forth in Exhibit B and the rates for MRCBTI’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 above shall be as set forth in Exhibit A.A. On or after December 1, 2005, BellSouth shall xxxx to BTI the amount owed for the Embedded Base of Dark Fiber Transport and the Embedded Base of Dark Fiber Transport Entrance Facilities for the period from March 11, 2005 to the Effective Date, and BTI shall pay such amount according to payment processes set forth in Attachment 7 of this Agreement. 6.9.1.7 The Transition Period shall apply only to MRCBTI’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC BTI shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment above and as set forth in Section 6.9.1.10 below. Further, MRC BTI shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4 above, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC BTI shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.61.6 above. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC BTI fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Southern Telcom as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCSouthern Telcom’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCSouthern Telcom’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCSouthern Telcom’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCSouthern Telcom’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Southern Telcom shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 5.9.1.1 For purposes of this Section 6.95.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 5.9.1.2 For purposes of this Section 6.95.9, Embedded Base means Dark Fiber Transport that was in service for MRC Xxxx as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 5.9.1.3 For purposes of this Section 6.95.9, a Business Line is as defined in 47 C.F.R. § 51.5.. 5.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1.4 5.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 5.9 only for MRC’s Xxxx’x Embedded Base during the Transition Period: 6.9.1.4.1 5.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during 5.9.1.5 During the Transition Period, the rates for MRC’s Xxxx’x Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 5.9.1.1 shall be as set forth in Exhibit B and the rates for MRC’s Xxxx’x Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 5.9.1 shall be as set forth in Exhibit A. 6.9.1.7 5.9.1.6 The Transition Period shall apply only to MRC’s Xxxx’x Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Xxxx shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities 5.9 pursuant to this Agreement. 6.9.1.8 5.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.45.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 5.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Preferred as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCPreferred’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCPreferred’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCPreferred’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCPreferred’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Preferred shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC UTI as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCUTI’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCUTI’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCUTI’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCUTI’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC UTI shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Micro-Comm as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCMicro-Comm’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCMicro-Comm’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCMicro-Comm’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCMicro-Comm’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Micro-Comm shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC BCFL as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCBCFL’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCBCFL’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCBCFL’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCBCFL’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC BCFL shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Quality Telephone as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCQuality Telephone’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCQuality Telephone’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCQuality Telephone’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCQuality Telephone’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Quality Telephone shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC Quality Telephone shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC Quality Telephone shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC Quality Telephone fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC U-Dial as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCU-Dial’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCU-Dial’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 shall be as set forth in Exhibit B and the rates for MRCU- Dial’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 The Transition Period shall apply only to MRCU-Dial’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC U-Dial shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC U-Dial shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.4, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC U-Dial shall submit spreadsheet(s) identifying all of the Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Base. 6.9.1.9.1 If MRC U-Dial fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC OnePoint as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCOnePoint’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCOnePoint’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCOnePoint’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCOnePoint’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC OnePoint shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Grande as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.1. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCGrande’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during the Transition Period, the rates for MRCGrande’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCGrande’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCGrande’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Grande shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.

Transition for Dark Fiber Transport and Dark Fiber Transport Entrance Facilities. 6.9.1.1 For purposes of this Section 6.9, the Transition Period for the Embedded Base of Dark Fiber Transport is the eighteen (18) month period beginning March 11, 2005 and ending September 10, 2006. 6.9.1.2 For purposes of this Section 6.9, Embedded Base means Dark Fiber Transport that was in service for MRC Think 12 as of March 10, 2005 in those wire centers that, as of such date, met the criteria set forth in 6.9. 1.4.12005. Subsequent disconnects or loss of End Users shall be removed from the Embedded Base. 6.9.1.3 For purposes of this Section 6.9, a Business Line is as defined in 47 C.F.R. § 51.5. 6.9.1.4 BellSouth shall make available Dark Fiber Transport as defined in this Section 6.9.1. Notwithstanding anything to the contrary in this Agreement, BellSouth shall make available Dark Fiber Transport as described in this Section 6.9 only for MRCThink 12’s Embedded Base during the Transition Period: 6.9.1.4.1 Dark Fiber Transport where both wire centers at the end points of the route contain 24,000 or more Business Lines or three (3) or more fiber-based collocators. 6.9.1.5 A list of wire centers meeting the criteria set forth in Section 6.9.1.4 above as of March 10, 2005, ("Initial List") is available on BellSouth's Interconnection Services Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx. 6.9.1.6 Notwithstanding the Effective Date of this Agreement, during During the Transition Period, the rates for MRCThink 12’s Embedded Base of Dark Fiber Transport as described in Section 6.9.1.2 6.9.1.1 shall be as set forth in Exhibit B and the rates for MRCThink 12’s Embedded Base of Dark Fiber Transport Entrance Facilities as described in Section 6.9.1 shall be as set forth in Exhibit A. 6.9.1.7 6.9.1.6 The Transition Period shall apply only to MRCThink 12’s Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities. MRC Think 12 shall not add new Dark Fiber Transport as described in this Section 6.9 except pursuant to the self-certification process as set forth in Section 1.8 of this Attachment and as set forth in Section 6.9.1.10 below. Further, MRC shall not add new Dark Fiber Entrance Facilities pursuant to this Agreement. 6.9.1.8 6.9.1.7 Once a wire center exceeds either of the thresholds set forth in this Section 6.9.1.46.9.1.4.1, no future Dark Fiber Transport unbundling will be required in that wire center. 6.9.1.9 No later than June 10, 2006 MRC shall submit spreadsheet(s) identifying all 6.9.1.8 At the end of the Transition Period any remaining Embedded Base of Dark Fiber Transport and Dark Fiber Entrance Facilities to will be either disconnected or converted to other BellSouth services as Conversions pursuant to Section 1.6. The Parties shall negotiate a project schedule for the Conversion of the Embedded Basedisconnected. 6.9.1.9.1 If MRC fails to submit the spreadsheet(s) specified in Section 6.9.