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During install, if sync cannot be obtained at the DSL jack, after filters are installed, the technician will try to obtain sync further backwards in the wiring, all the way to the NID if necessary. This will eliminate or identify house wiring problems that cause sync problems.
If sync cannot be obtained at the NID, the Technician will call in to run a test to see if sync "noise" reaches the DSLAM at your CO or not. No noise at the DSLAM means a problem at the CO, most likely, your line has not been cross-connected to the CLEC DSLAM properly.
If noise is heard at the DSLAM, but sync is not obtained, then the technician may report the install is technically not feasible, which means your order is cancelled. If the technician has CO access they may be able to further troubleshoot CO wiring issues, improving the speed at which the ILEC can resolve the problem.

If sync cannot be obtained at the jack, then the technician may install a NID splitter, and run a new wire for the data.. this removes the need for microfilters.

If sync is lost intermittently at the jack, then the technician may test at the NID to see if sync is stable there. If it is, a splitter may be installed to avoid the internal wiring problems of the house.

Sync problems at the NID may require further work at the CO to isolate the problem to the loop (the line), in which case, the install is cancelled with a technically not feasible.


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