CG-STUG-001 Issue 1.28-August 4, 2006

Basic Service Features

Unbundled Interoffice Transport - Shared (UIT-S) provides a transmission path, and its associated electronics, allowing calls to be transported from a BellSouth end office to a BellSouth end office, BellSouth end office to a BellSouth tandem, or BellSouth tandem to a BellSouth tandem. These facilities/trunk groups are shared among all network providers that require calls to be transported between particular switching locations. These facilities/trunk groups may be transported over various transmission configurations (e.g., DS1, OC3) based on total shared network requirements. An example of a typical configuration for this UNE is as follows:

In the above diagram, Unbundled Interoffice Transport - Shared applies to the transport portion of the service only (i.e., the Tandem Switch and the End Office Switch are excluded from this rate element.) The elements associated with UIT-S include the physical transport facilities (e.g., fiber), any regenerating equipment, and the facility terminating equipment such as fiber-optic terminals and multiplexing equipment.

UIT-S carries the originating traffic of a CLEC end-user (that utilizes BellSouth's Unbundled Local Switching and Unbundled Tandem Switching elements) to another BellSouth end office, to a BellSouth tandem, or between BellSouth tandems.

Basic Service Capabilities And Restrictions

CLECs will utilize UIT-S to originate traffic and terminate their access traffic within the BellSouth network. Various call flow diagrams have been developed that provide details of how UIT-S will be utilized. These call flows are found at the end of this UIT-S section.

The SS7 network will be utilized for call setup. This network will establish the physical connections for the call and will also determine when busy conditions exist.

CLECs will be required to interconnect with at least one BellSouth tandem in each LATA. For toll traffic, it is possible that toll tandem-to-toll tandem connections will be utilized.

When CLECs are switchless providers, they will utilize BellSouth UNEs to originate and terminate their calls. In this case, the interoffice mileage will be computed based on the airline mileage between the originating BellSouth End Office and the terminating BellSouth End Office regardless of how the call is actually routed.

Note:
No distinction will be made in computing the mileage if the Serving Wire Center has its own switch or if the Serving Wire Center is utilizing a remote switch.

Figure 4 depicts several routing possibilities. As mentioned earlier, it is possible that the call could actually route through two toll tandem offices. It is also possible that the BellSouth Tandem could establish shared direct trunk groups between the originating BellSouth End Office and the terminating BellSouth End Office. A meld of these possible configurations was utilized to determine the cost for this UNE.

How Does This Service Work?

UIT-S is not ordered by the CLEC and is available when used with unbundled local switching. Billing for UIT-S will be done based on minutes of use and mileage. UIT-S provides a transmission path, and its associated electronics, between switching locations. These facilities/trunk groups may be configured in various transmission configurations (DS1, DS3, etc.) based on total shared network requirements between switching locations. Depending on the distance between switching locations and the total service demands required, different combinations of SONET interoffice facilities may be utilized to transport the DS1 facilities carrying these shared trunk groups.

General Description of Performance Standards and Reliability

Trunk Group Service Performance Objectives:

• Final Trunk Groups between BellSouth Switches carrying Local traffic:The Design Blocking Objective is 1.0% during the Average Time Consistent Busy Hour over a 20-day period. These trunk groups are monitored for blockages on a weekly basis.
• This UNE will be designed to meet the transmission standards in BellSouth's technical publications similar to those facilities used for Common Transport Trunk Groups.Diversity Requirements: Some level of diversity will exist in BellSouth network (embedded and forward-looking).
• Special Considerations:Billing Guarantees do not apply

Deployment Schedule

There will be widespread deployment assuming current Central Office capabilities.

Feature Interaction

Customers purchasing this UNE will also be billed the Unbundled Tandem Switching, when appropriate, (UTS) and must have purchased an Unbundled Local Switching (ULS) port.

Installation Intervals are not applicable to UIT-S.

Service Inquiry and Ordering Guidelines are not applicable to UIT-S.