T1/T3 Circuit Troubleshooting Using Loopback
Date Posted: March 01, 2008 04:42 PM
Author: Mel Beckman
Dear Doctor, We have several T1 and T3 circuits between our main office and branch locations. These all connect to a central router, which relays traffic between the branches and to our centralized server farm. Lately we've experienced a series of circuit outages that we can't diagnose. We suspect the telco provider, but it always runs a "loop-back" test to our equipment at each location and reports that the failed circuit is operating normally, indicating a hardware failure with our gear. But after the provider conducts its tests, the circuit mysteriously comes back online. We ask for support from our hardware vendor, and the vendor says it's the telco's fault. How can we stop the finger pointing and get to the bottom of this?

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