AT&T Clec Online

Handbook for California and Nevada

Maintenance/Repair for Line Splitting

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Line Splitting Maintenance Processes


Because the line splitting process allows CLECs to order two separate UNEs, and the CLEC then combines the UNEs in its collocation arrangement, AT&T 12-State has no record to indicate how any UNEs may be combined or otherwise related.  Trouble tickets can be issued only after all orders for each individual UNE associated with the line splitting arrangement have been completed.   If all orders have not been completed, a trouble ticket may not be opened by CLEC.  Rather, the CLEC must call the LSC.  The LSC would assist the CLEC on any issues with the pending service orders.  If the CLEC experiences trouble with its line splitting arrangement after the service orders have completed, the CLEC must report trouble to the LOC.  When reporting trouble to the LOC in connection with a line splitting arrangement, the CLEC must isolate and report the trouble to either the ULS-ST port (SXRU circuit id) or the xDSL-capable UNE loop (LXFP circuit id). 


For voice trouble, once the service orders are complete, MLT testing is recommended prior to reporting a case of trouble.   If the MLT test shows dispatch IN, CLEC should open a trouble ticket using the SXRU circuit ID, followed by the TN.  If the MLT shows trouble OUT, CLEC should open trouble ticket on the xDSL-capable UNE loop using the LXFP circuit ID.  The type of voice trouble should be provided (e.g., no dial tone, noisy static, etc.) along with the telephone number for testing and verification.  Data trouble tickets should be opened only on the xDSL-capable UNE loop using the LXFP circuit ID and with an appropriate trouble indication.  Every ticket requires both CFA and circuit ID information.


  • The CLEC should determine if there is dial tone on its CFA block(s).
  • If the CLEC has no dial tone at the CFA attached to the ULS-ST port, the CLEC should open a repair ticket on the UNE Switch Port to Cage telephone number.
  • If dial tone is present at the CFA block(s) attached to the ULS-ST port, the CLEC would then need to verify dial tone is leaving its cage by checking the xDSL-capable UNE Loop CFA.
  • If dial tone is not leaving their cage at the CFA (but dial tone is present at the ULS-ST port), the CLEC should NOT open a repair ticket, as the trouble has been isolated to within its cage.
  • If dial tone is leaving their cage, the CLEC should open a repair ticket on the xDSL-capable UNE Loop.