As a followup to my post last week concerning troubleshooting a problem T1 circuit, it looks like we are finally making some progress. After working on the issue yesterday, a cable specialist was dispatched out to work on narrowing down exactly what and where the problem lies along the cable span. The carrier sent me an update stating that the LEC (Local Exchange Carrier) has:  “dispatched a cable specialist who has determined there is an unbalanced signal between the last repeater in the local loop distribution plant and the customer premises”.

An “unbalanced signal”….well, that’s a new one for me. But hey, as long as it gets fixed, I’m fine with that.

When I first arrived at work this morning, I checked my stats on the router and verified the circuit was still taking heavy errors…

T1 circuit still taking heavy errors

Later in the day I received an update from the carrier stating that a repair had been made, and that they showed the circuit running clean for the last two hours. Hmmm…really…let me check…

Circuit running clean for the last two hours

Well, well…the circuit really is running clean for the last two hours (8 intervals). NICE!!

One more thing to do…clear the counters on the serial interface. Take a look at the stats on the serial interface…LOTS of accumulated errors over the last 2+ years….so lets clear all those stats and keep track of the circuit from this point on…

Show interface information, and clearing the stats

I’ll be keeping track of this T1 over the next several days to see if the repair made by the carrier really did fix the issue. Fingers are crossed!!