I have a pair of 1721's over a p-t-p T1 with internal DSU/CSU 1T V2 cards. Telco ran end to end test with no errors. Both ends are set to ESF and B8ZS. One end has clocking set to internal and other end set to line. Telco is not providing clocking. Encapsulation is set to HDSL. Line keeps boucing up and down every minute. Telco installed Netopia routers and all works fine. I have replaced all cabling and the WIC card in both routers. What am I missing?
One thing you could possibly try is to make a loopback plug so that you can loop the line at one end. Then, you can see if you are still getting errors.
Here's what I mean:
RtA ------- RtB
Connect a hardware loop plug to the line at RtB which loops the received signal to the transmit signal. Therefore, you will get an end-to-end test from RtrA and through the line. Then, repeat the process by connecting the loopback plug at the RtA end of the line...
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