Common use of Unbundled Switching Elements Clause in Contracts

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Mpower may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Mpower may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Mpower to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3.

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. .g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.312.3 SUPPORT SERVICES FOR RESALE

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Global may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Global may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Global to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3.

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s 's local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.33.0 INITIAL NETWORK IMPLEMENTATION SCHEDULE FOR NEW JERSEY In accordance with the provisions of Section 3 of the Agreement, the Parties shall make their best efforts to meet the following initial Milestones no later than the listed Dates. ================================================================================ LATA in Milestone Date NEW JERSEY -------------------------------------------------------------------------------- LATA ___ LATA Start Date TBD ----------------------------------------------------------- SS7 Certification, Collocation, TBD Operator Services/DA Facilities, and NXX(s) Applied For ----------------------------------------------------------- Parties Agree on Trunking Arrangements TBD for Traffic Exchange ----------------------------------------------------------- Valid Access Service Request(s) TBD ("ASRs") for Traffic Exchange Trunk Groups and Routing Information Received by BA ----------------------------------------------------------- Valid Orders for 911 Facilities TBD Received by BA ----------------------------------------------------------- All Trunks (Traffic Exchange, Operator TBD Services/DA, 911) Tested and Turned Up ----------------------------------------------------------- SS7 Certification Achieved; 1 TBD Collocation Arrangements Complete for Trunk Interconnection and Access to Network Elements ----------------------------------------------------------- Arrangements for Alternate-Billed Calls TBD Agreed Upon ----------------------------------------------------------- Call-through Testing Completed; TBD "Interconnection Activation Date" ================================================================================ Failure of a Party or the Parties to meet an earlier Milestone Date shall not relieve either Party of the responsibility to make its best efforts to meet subsequent Milestone Date(s) in the LATA, unless, and only to the extent that, the subsequent Milestone Date(s) depend on the timely completion of such earlier Milestone Date. For purposes of Section 3, (i) business Telephone Exchange Service shall be considered "fully operational" in a LATA in New Jersey when Covad has an effective Tariff for business Telephone Exchange Service in New Jersey and a significant number of Telephone Exchange Service Customer lines in service for business Telephone Exchange Service Customers in that LATA in New Jersey that are not affiliates or employees of either BA or Covad, and (ii) residential Telephone Exchange Service shall be considered "fully operational" in a LATA in New Jersey when Covad has an effective Tariff for

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 TCG may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 TCG may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA Xxxx Atlantic does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 TCG to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.327.1 PERFORMANCE INTERVAL DATES FOR SPECIFIED ACTIVITIES

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 USWest may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 USWest may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 USWest to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 ACI may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 ACI may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 ACI to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3.

Unbundled Switching Elements. Local Switching LOCAL SWITCHING The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. E.G. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s 's local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 ACI may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 ACI may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 ACI to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching TANDEM SWITCHING The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.312.3 SUPPORT SERVICES FOR RESALE

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s 's local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.33.0 INITIAL NETWORK IMPLEMENTATION SCHEDULE FOR DISTRICT OF COLUMBIA In accordance with the provisions of Section 3 of the Agreement, the Parties shall make their best efforts to meet the following initial Milestones no later than the listed Dates.

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s 's local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.33.0 INITIAL NETWORK IMPLEMENTATION SCHEDULE FOR VIRGINIA In accordance with the provisions of Section 3 of the Agreement, the Parties shall make their best efforts to meet the following initial Milestones no later than the listed Dates.

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SV033099 SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 ICI may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 ICI may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA Bell Atlantic does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 ICI to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.327.1 PERFORMANCE INTERVAL DATES FOR SPECIFIED ACTIVITIES

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s 's local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.312.3 SUPPORT SERVICES FOR RESALE 1. BA OSS SERVICES

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 TCG may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 TCG may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA Bell Atlantic does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 TCG to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.327.1 PERFORMANCE INTERVAL DATES FOR SPECIFIED ACTIVITIES

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Compass may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Compass may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Compass to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Mpower may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Mpower may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Mpower to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem Tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Transwire may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Transwire may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Transwire to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 Covad may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 Covad may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 Covad to pay the recurring and non-non- recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side line side and Trunk Side trunk side facilities (e.g. line and Trunk Side trunk side Ports such as analog and ISDN Line Side line side Ports and DS1 Trunk Side trunk side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customerscustomers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 KMC may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 KMC may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA Xxxx Atlantic does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 KMC to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3BA-MD/KMC 12/15/97

Unbundled Switching Elements. Local Switching The unbundled local Switching Elements include Line Side and Trunk Side facilities (e.g. line and Trunk Side Ports such as analog and ISDN Line Side Ports and DS1 Trunk Side Ports) plus the features, functions, and capabilities of the switch. It consists of the line-side Port (including connection between a loop termination and a switch line card, telephone number assignment, basic intercept, one primary directory listing, presubscription, and access to 911, operator services, and directory assistance), line and line group features (including all vertical features and line blocking options that the switch and its associated deployed switch software is capable of providing and are currently offered to BA’s local exchange Customers), usage (including the connection of lines to lines, lines to trunks, trunks to lines, and trunks to trunks), and trunk features (including the connection between the trunk termination and a trunk card). BA shall offer, as an optional chargeable feature, daily usage tapes. Level 3 MFN may request activation or deactivation of features on a per-port basis at any time, and shall compensate BA for the non-recurring charges associated with processing the order. Level 3 MFN may submit a Bona Fide Request for other switch features and functions that the switch is capable of providing, but which BA does not currently provide, or for customized routing of traffic other than operator services and/or directory assistance traffic. BA shall develop and provide these requested services where technically feasible with the agreement of Level 3 MFN to pay the recurring and non-recurring costs of developing, installing, updating, providing and maintaining these services. Tandem Switching The unbundled tandem Switching Element includes trunk-connect facilities, the basic switching function of connecting trunks to trunks, and the functions that are centralized in Tandem Switches. Unbundled tandem switching creates a temporary transmission path between interoffice trunks that are interconnected at a BA Access Tandem for the purpose of routing a call or calls. SCHEDULE 12.3