Common use of Switching System Hierarchy Clause in Contracts

Switching System Hierarchy. 4.2.1 For purposes of this Article IV, each of the following Central Office Switches shall be designated as a “Primary Switch”: (a) Each access Tandem Ameritech operates in the LATA; (b) The initial switch Requesting Carrier employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier may establish for provision of Exchange Access in the LATA; and (d) Any additional switch Requesting Carrier may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Primary Switches for a LATA may not exceed the total number of Ameritech’s Primary Switches for that LATA. To the extent Requesting Carrier chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech of such designation at least ninety (90) days in advance of the date on which Requesting Carrier activates such switch as a Primary Switch. 4.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 shall be designated as a “Secondary Switch”. 4.2.3 For purposes of Requesting Carrier routing traffic to Ameritech, sub-tending arrangements between Ameritech Primary Switches and Ameritech Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Ameritech maintains for those switches. For purposes of Ameritech routing traffic to Requesting Carrier, subtending arrangements between Requesting Carrier Primary Switches and Requesting Carrier Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Requesting Carrier maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Access Tandem Ameritech NYNEX operates in the LATA; (b) The initial switch Requesting Carrier NEFC employs to provide Telephone Exchange Service in the LATA; (c) Any access Access Tandem Requesting Carrier NEFC may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier NEFC may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier NEFC may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier NEFC Primary Switches for a LATA may not exceed the total number of Ameritech’s NYNEX Primary Switches for that LATA. To the extent Requesting Carrier NEFC chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech NYNEX of such designation at least ninety (90) days in advance of the date on which Requesting Carrier NEFC activates such switch as a Primary Switch; and (e) Any additional tandem switch NYNEX may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred-eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “"Secondary Switch”". 4.2.3 5.2.3 For purposes of Requesting Carrier NEFC routing traffic to AmeritechNYNEX, sub-tending arrangements between Ameritech NYNEX Primary Switches and Ameritech NYNEX Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech NYNEX maintains for those switches. For purposes of Ameritech NYNEX routing traffic to Requesting CarrierNEFC, subtending arrangements between Requesting Carrier NEFC Primary Switches and Requesting Carrier NEFC Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Requesting Carrier NEFC maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Access Tandem Ameritech BA operates in the LATA; (b) The initial switch Requesting Carrier HARVARDNET employs to provide Telephone Exchange Service in the LATA, which may be the same as (c), below; (c) Any access Access Tandem Requesting Carrier HARVARDNET may establish for provision of Exchange Access in the LATA; and (d) Any additional switch Requesting Carrier HARVARDNET may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier HARVARDNET may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Primary Switches for a LATA may not exceed the total number of Ameritech’s Primary Switches for that LATA. To the extent Requesting Carrier HARVARDNET chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier HARVARDNET activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a Tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “"Secondary Switch”". 4.2.3 5.2.3 For purposes of Requesting Carrier HARVARDNET routing traffic to AmeritechBA, sub-tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech BA maintains for those switches. For purposes of Ameritech BA routing traffic to Requesting CarrierHARVARDNET, subtending sub-tending arrangements between Requesting Carrier HARVARDNET Primary Switches and Requesting Carrier HARVARDNET Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Requesting Carrier HARVARDNET maintains for those switches. Nothing in this subsection should be deemed to prevent HARVARDNET from creating subtending arrangements within the same switch. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5, each of the following Central Office Switches shall be designated as a “Primary Switch”: (a) Each access Access Tandem Ameritech NYNEX operates in the a LATA; (b) The initial switch Requesting Carrier ANTC employs to provide Telephone Exchange Service in the a LATA; (c) Any access Access Tandem Requesting Carrier ANTC may establish for provision of Exchange Access in the a LATA; and; (d) Any additional switch Requesting Carrier ANTC may subsequently employ to provide Telephone Exchange Service in the a LATA which Requesting Carrier ANTC may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier ANTC Primary Switches for a LATA may not exceed the total number of Ameritech’s NYNEX Primary Switches for that LATA. To the extent Requesting Carrier ANTC chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech NYNEX of such designation at least ninety (90) days Days in advance of the date on which Requesting Carrier ANTC activates such switch as a Primary Switch; and (e) Any additional tandem switch NYNEX may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) Days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 5.2.3 For purposes of Requesting Carrier ANTC routing traffic to AmeritechNYNEX, sub-tending arrangements between Ameritech NYNEX Primary Switches and Ameritech NYNEX Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech NYNEX maintains for those switches. For purposes of Ameritech NYNEX routing traffic to Requesting CarrierANTC, subtending sub-tending arrangements between Requesting Carrier ANTC Primary Switches and Requesting Carrier ANTC Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Requesting Carrier ANTC maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Tandem Ameritech Office BA operates in the LATA; (b) The initial switch Requesting Carrier DSL employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier Office DSL may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier DSL may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier DSL may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier DSL Primary Switches for a LATA may not exceed the total number of Ameritech’s BA Primary Switches for that LATA. To the extent Requesting Carrier DSL chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier DSL activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction 5.2.2 For purposes of this Section 5.0, each of the following Central Office Switches shall be designated as a “Secondary Switch”. 4.2.2 (a) Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 (b) A geographically relevant End Office or functional equivalent, at a technically feasible IP established by one Party at the other Party’s request (collectively, a “Virtual End Office”). For purposes of Requesting Carrier this Agreement, a “geographically relevant” IP shall mean an IP that is located within the same Rate Center Area as the NXX’s to which traffic is to be terminated are assigned, or, with the mutual agreement of the Parties, an existing and currently utilized IP within the LATA but outside the applicable Rate Center Area. If after sixty (60) days following said request, the 5.2.3 For purposes of DSL routing traffic to AmeritechBA, the sub-tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Ameritech BA maintains for those switchesthe routing of its own or other carriers’ traffic. For purposes of Ameritech BA routing traffic to Requesting CarrierDSL, subtending the sub-tending arrangements between Requesting Carrier DSL Primary Switches and Requesting Carrier DSL Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Requesting Carrier DSL maintains for those switchesthe routing of its own or other carriers’ traffic. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Tandem Ameritech Office BA operates in the LATA; (b) The initial switch Requesting Carrier Covad employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier Office Covad may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier Covad may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier Covad may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Covad Primary Switches for a LATA may not exceed the total number of Ameritech’s BA Primary Switches for that LATA. To the extent Requesting Carrier Covad chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier Covad activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction. 4.2.2 5.2.2 For purposes of this Section 5.0, each of the following Central Office Switches shall be designated as a “Secondary Switch”. (a) Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 (b) A geographically relevant End Office or functional equivalent, at a technically feasible IP established by one Party at the other Party’s request (collectively, a “Virtual End Office”). For purposes of Requesting Carrier this Agreement, a “geographically relevant” IP shall mean an IP that is located within the same Rate Center Area as the NXX’s to which traffic is to be terminated are assigned, or, with the mutual agreement of the Parties, an existing and currently utilized IP within the LATA but outside the applicable Rate Center Area. If after sixty (60) days following said request, the Parties have been unable to reach agreement on the additional Interconnection Point(s), then either Party may file a complaint with the Department to resolve such impasse or pursue any other remedy available under law or equity. 5.2.3 For purposes of Covad routing traffic to AmeritechBA, sub-tending the sub‑tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Tandem/End Office sub‑tending arrangements which BA maintains for the routing of its own or other carriers’ traffic. For purposes of BA routing traffic to Covad, the sub-tending arrangements which Ameritech maintains for those switches. For purposes of Ameritech routing traffic to Requesting Carrier, subtending arrangements between Requesting Carrier Covad Primary Switches and Requesting Carrier Covad Secondary Switches shall be the same as the access Tandem/End Office sub-tending sub‑tending arrangements which Requesting Carrier Covad maintains for those switchesthe routing of its own or other carriers’ traffic. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Access Tandem Ameritech NYNEX operates in the LATA; (b) The initial switch Requesting Carrier XXXXXX FIBER employs to provide Telephone Exchange Service in the LATA; (c) Any access Access Tandem Requesting Carrier XXXXXX FIBER may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier XXXXXX FIBER may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier XXXXXX FIBER may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier XXXXXX FIBER Primary Switches for a LATA may not exceed the total number of Ameritech’s NYNEX Primary Switches for that LATA. To the extent Requesting Carrier XXXXXX FIBER chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech NYNEX of such designation at least ninety (90) days in advance of the date on which Requesting Carrier XXXXXX FIBER activates such switch as a Primary Switch; and (e) Any additional tandem switch NYNEX may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub- tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred-eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “"Secondary Switch”". 4.2.3 5.2.3 For purposes of Requesting Carrier XXXXXX FIBER routing traffic to AmeritechNYNEX, sub-tending arrangements between Ameritech NYNEX Primary Switches and Ameritech NYNEX Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech NYNEX maintains for those switches. For purposes of Ameritech NYNEX routing traffic to Requesting CarrierXXXXXX FIBER, subtending arrangements between Requesting Carrier XXXXXX FIBER Primary Switches and Requesting Carrier XXXXXX FIBER Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Requesting Carrier XXXXXX FIBER maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Tandem Ameritech Office BA operates in the LATA; (b) The initial switch Requesting Carrier MGC employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier Office MGC may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier MGC may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier MGC may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier MGC Primary Switches for a LATA may not exceed the total number of Ameritech’s BA Primary Switches for that LATA. To the extent Requesting Carrier MGC chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier MGC activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction. 4.2.2 5.2.2 For purposes of this Section 5.0, each of the following Central Office Switches shall be designated as a "Secondary Switch". (a) Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “"Secondary Switch”". 4.2.3 (b) A geographically relevant End Office or functional equivalent, at a technically feasible IP established by one Party at the other Party's request (collectively, a "Virtual End Office"). For purposes of Requesting Carrier this Agreement, a "geographically relevant" IP shall mean an IP that is located within the same Rate Center Area as the NXX's to which traffic is to be terminated are assigned, or, with the mutual agreement of the Parties, an existing and currently utilized IP within the LATA but outside the applicable Rate Center Area. If after sixty (60) days following said request, the Parties have been unable to reach agreement on the additional Interconnection Point(s), then either Party may file a complaint with the Commission to resolve such impasse or pursue any other remedy available under law or equity. 5.2.3 For purposes of MGC routing traffic to AmeritechBA, the sub-tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Ameritech BA maintains for those switchesthe routing of its own or other carriers' traffic. For purposes of Ameritech BA routing traffic to Requesting CarrierMGC, subtending the sub-tending arrangements between Requesting Carrier MGC Primary Switches and Requesting Carrier MGC Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Requesting Carrier MGC maintains for those switchesthe routing of its own or other carriers' traffic. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection (5.0), each of the following Central Office Switches shall be designated as a “Primary Switch”: (a) Each access each Access Tandem Ameritech BA-RI operates in the LATA; (b) The the initial switch Requesting Carrier Cox employs to provide Telephone Exchange Service in the LATA; (c) Any access any Access or other Tandem Requesting Carrier Cox may establish for provision of Exchange Access in the LATA; and; (d) Any any additional switch Requesting Carrier or virtual switch Cox may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier Cox may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Cox Primary Switches for a LATA may not not, without mutual agreement, exceed the total number of Ameritech’s BA-RI Primary Switches for that LATA. To the extent Requesting Carrier Cox chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA-RI of such designation at least ninety (90) days in advance of the date on which Requesting Carrier Cox activates such switch as a Primary Switch; (e) any additional Access Tandem switch BA-RI may subsequently employ within a LATA. Traffic destined to subtending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to Cox and all LECs at least one hundred-eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 5.2.3 For purposes of Requesting Carrier Cox routing traffic to AmeritechBA-RI, sub-tending arrangements between Ameritech BA-RI Primary Switches and Ameritech BA-RI Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech BA-RI maintains for those switches. For purposes of Ameritech BA-RI routing traffic to Requesting CarrierCox, subtending arrangements between Requesting Carrier Coxfls Primary Switches and Requesting Carrier Coxfls Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending subtending arrangements which Requesting Carrier Cox maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection (5.0), each of the following Central Office Switches shall be designated as a “Primary Switch”: (a) Each access each Access Tandem Ameritech BA-RI operates in the LATA; (b) The the initial switch Requesting Carrier Cox employs to provide Telephone Exchange Service in the LATA; (c) Any access any Access or other Tandem Requesting Carrier Cox may establish for provision of Exchange Access in the LATA; and; (d) Any any additional switch Requesting Carrier or virtual switch Cox may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier Cox may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Cox Primary Switches for a LATA may not not, without mutual agreement, exceed the total number of Ameritech’s BA-RI Primary Switches for that LATA. To the extent Requesting Carrier Cox chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA-RI of such designation at least ninety (90) days in advance of the date on which Requesting Carrier Cox activates such switch as a Primary Switch; (e) any additional Access Tandem switch BA-RI may subsequently employ within a LATA. Traffic destined to sub- tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to Cox and all LECs at least one hundred- eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 5.2.3 For purposes of Requesting Carrier Cox routing traffic to AmeritechBA-RI, sub-tending arrangements between Ameritech BA-RI Primary Switches and Ameritech BA-RI Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech BA-RI maintains for those switches. For purposes of Ameritech BA-RI routing traffic to Requesting CarrierCox, subtending arrangements between Requesting Carrier Cox=s Primary Switches and Requesting Carrier Cox=s Secondary Switches shall be the same as the access Access Tandem/End Office sub-sub- tending arrangements which Requesting Carrier Cox maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection (5.0), each of the following Central Office Switches shall be designated as a “Primary Switch”: (a) Each access each Access Tandem Ameritech BA-RI operates in the LATA; (b) The the initial switch Requesting Carrier Cox employs to provide Telephone Exchange Service in the LATA; (c) Any access any Access or other Tandem Requesting Carrier Cox may establish for provision of Exchange Access in the LATA; and; (d) Any any additional switch Requesting Carrier or virtual switch Cox may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier Cox may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Cox Primary Switches for a LATA may not not, without mutual agreement, exceed the total number of Ameritech’s BA-RI Primary Switches for that LATA. To the extent Requesting Carrier Cox chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA-RI of such designation at least ninety (90) days in advance of the date on which Requesting Carrier Cox activates such switch as a Primary Switch; (e) any additional Access Tandem switch BA-RI may subsequently employ within a LATA. Traffic destined to subtending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to Cox and all LECs at least one hundred-eighty (180) days prior to service introduction. 4.2.2 5.2.2 Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 5.2.3 For purposes of Requesting Carrier Cox routing traffic to AmeritechBA-RI, sub-tending arrangements between Ameritech BA-RI Primary Switches and Ameritech BA-RI Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending arrangements which Ameritech BA-RI maintains for those switches. For purposes of Ameritech BA-RI routing traffic to Requesting CarrierCox, subtending arrangements between Requesting Carrier Xxx’x Primary Switches and Requesting Carrier Xxx’x Secondary Switches shall be the same as the access Access Tandem/End Office sub-tending subtending arrangements which Requesting Carrier Cox maintains for those switches. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Tandem Ameritech Office BA operates in the LATA; (b) The initial switch Requesting Carrier Covad employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier Office Covad may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier Covad may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier Covad may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier Covad Primary Switches for a LATA may not exceed the total number of Ameritech’s BA Primary Switches for that LATA. To the extent Requesting Carrier Covad chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier Covad activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction. 4.2.2 5.2.2 For purposes of this Section 5.0, each of the following Central Office Switches shall be designated as a “Secondary Switch”. (a) Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “Secondary Switch”. 4.2.3 (b) A geographically relevant End Office or functional equivalent, at a technically feasible IP established by one Party at the other Party’s request (collectively, a “Virtual End Office”). For purposes of Requesting Carrier this Agreement, a “geographically relevant” IP shall mean an IP that is located within the same Rate Center Area as the NXX’s to which traffic is to be terminated are assigned, or, with the mutual agreement of the Parties, an existing and currently utilized IP within the LATA but outside the applicable Rate Center Area. If after sixty (60) days following said request, the Parties have been unable to reach agreement on the additional Interconnection Point(s), then either Party may file a complaint with the Department to resolve such impasse or pursue any other remedy available under law or equity. 5.2.3 For purposes of Covad routing traffic to AmeritechBA, the sub-tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Ameritech BA maintains for those switchesthe routing of its own or other carriers’ traffic. For purposes of Ameritech BA routing traffic to Requesting CarrierCovad, subtending the sub-tending arrangements between Requesting Carrier Covad Primary Switches and Requesting Carrier Covad Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Requesting Carrier Covad maintains for those switchesthe routing of its own or other carriers’ traffic. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.

Switching System Hierarchy. 4.2.1 5.2.1 For purposes of this Article IVSection 5.0, each of the following Central Office Switches shall be designated as a “"Primary Switch”": (a) Each access Tandem Ameritech Office BA operates in the LATA; (b) The initial switch Requesting Carrier MGC employs to provide Telephone Exchange Service in the LATA; (c) Any access Tandem Requesting Carrier Office MGC may establish for provision of Exchange Access in the LATA; and; (d) Any additional switch Requesting Carrier MGC may subsequently employ to provide Telephone Exchange Service in the LATA which Requesting Carrier MGC may at its sole option designate as a Primary Switch; provided that the total number of Requesting Carrier MGC Primary Switches for a LATA may not exceed the total number of Ameritech’s BA Primary Switches for that LATA. To the extent Requesting Carrier MGC chooses to designate any additional switch as a Primary Switch, it shall provide notice to Ameritech BA of such designation at least ninety (90) days in advance of the date on which Requesting Carrier MGC activates such switch as a Primary Switch; and (e) Any additional tandem switch BA may subsequently employ to provide access and/or sector traffic capacity within a LATA. Traffic destined to sub-tending Secondary Switches routed via such a tandem(s) would be determined by network requirements and notice made available to all LECs at least one hundred and eighty (180) days prior to service introduction. MGC COMMUNICATIONS, INC. - XXXX ATLANTIC Interconnection Agreement 5.2.2 For purposes of this Section 5.0, each of the following Central Office Switches shall be designated as a "Secondary Switch". 4.2.2 (a) Each Central Office Switch operated by the Parties which is not designated as a Primary Switch pursuant to Section IV.2.1 5.2.1 shall be designated as a “"Secondary Switch”". 4.2.3 (b) A geographically relevant End Office or functional equivalent, at a technically feasible IP established by one Party at the other Party's request (collectively, a "Virtual End Office"). For purposes of Requesting Carrier this Agreement, a "geographically relevant" IP shall mean an IP that is located within the same Rate Center Area as the NXX's to which traffic is to be terminated are assigned, or, with the mutual agreement of the Parties, an existing and currently utilized IP within the LATA but outside the applicable Rate Center Area. If after sixty (60) days following said request, the Parties have been unable to reach agreement on the additional Interconnection Point(s), then either Party may file a complaint with the Commission to resolve such impasse or pursue any other remedy available under law or equity. 5.2.3 For purposes of MGC routing traffic to AmeritechBA, the sub-tending arrangements between Ameritech BA Primary Switches and Ameritech BA Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Ameritech BA maintains for those switchesthe routing of its own or other carriers' traffic. For purposes of Ameritech BA routing traffic to Requesting CarrierMGC, subtending the sub-tending arrangements between Requesting Carrier MGC Primary Switches and Requesting Carrier MGC Secondary Switches shall be the same as the access Tandem/End Office sub-tending arrangements which Requesting Carrier MGC maintains for those switchesthe routing of its own or other carriers' traffic. 4.2.4 Either Party may unilaterally reclassify its Central Office Switch as either a Primary Switch or Secondary Switch provided that such Party provides the other Party written notice thereof not less than one hundred and eighty (180) days prior to such reclassification.