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Handbook for California and Nevada

Trunk Group Servicing Request (TGSR)

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Trunk Group Servicing Request (TGSR)

The Trunk Group Servicing Request (TGSR) process is used to provide trunk capacity recommendations between AT&T West and interconnecting CLECs. The procedures below address the TGSR process used to alert the CLEC that their interconnection trunks are being over or under utilized.

Over Utilization
A TGSR will be issued by AT&T West Trunk Planning and Engineering when additional capacity is required to reduce measure blocking to objective designed blocking levels based upon analysis of trunk group data. 

In a blocking final situation, AT&T West shall attempt to call the CLEC prior to issuing the TGSR, and will advise the CLEC to note 'Service Affecting' on the ASR.   

In a blocking final situation, either Party upon receipt of a TGSR will issue an ASR to the other Party:   

  • Within three (3) business days after receipt of the TGSR, upon review of and in response to the TGSR received; or   
  • At any time as a result of either Party's own capacity assessment, in order to begin the provisioning process. The intervals used for the provisioning process will be the same as those used for AT&T West's Switched Access service.

In addition, in a blocking situation, AT&T West shall accept trouble tickets at the LOC regarding the trunk blockage. AT&T West will report the resolution of the blockage situation back to the CLEC.   

Under Utilization

AT&T West will not automatically enforce Interconnection Agreement provisions regarding taking back under utilized trunks, but will first issue a TGSR and/or consult with the CLEC, in the manner described below. Except where specific contradictory contract language exists, joint facility planning will be implemented as detailed below. 

Those situations where more capacity exists than actual usage requires will be handled in the following manner:   

  • If a trunk group is under 75 percent (75%) of CCS capacity on a monthly average basis, for each month of any three consecutive months period, either Party may request the issuance of an order to resize the trunk group, which shall be left with not less than 25 percent (25%) excess capacity. In all cases grade of service objectives shall be maintained.   
  • Either party may send a Trunk Group Service Request ('TGSR') to the other Party to trigger changes to the Local Interconnection Trunk Groups based on capacity assessment. Upon receipt of a TGSR, the receiving Party will issue an ASR to the other Party within twenty (20) business days after receipt of the TGSR. A Party may also issue an ASR at any time as a result of the Party's own capacity management assessment.   
  • Upon review of the TGSR, if a Party does not agree with the resizing, the Parties will schedule a joint planning discussion within the 20 business days. The Parties will meet to resolve and mutually agree to the disposition of the TGSR.   
  • If AT&T West does not receive an ASR, or if the CLEC does not respond to the TGSR by scheduling a joint discussion within the 20 business day period, AT&T West will attempt to contact the CLEC to schedule a joint planning discussion. If the CLEC will not agree to meet within an additional 5 business days and present adequate reason for keeping trunks operational, AT&T West will issue an ASR to disconnect the Interconnection trunks and facilities.