I am having troubles here configuring plain point to point T1. The serial interface is keep going up and down.
I tried to put a hardware loop and it showed serial int as up/down.
I tried to put a software loopback diag on controller t1 and serial int showes as up/down. When I replaced hardware loop with T1 cable it biefly showed eigrp neighbor on this int and then it went down again.
Thank you for your help. We have always used the regular cat5e cable to extend t1 from smatjack to the router. I will try to use a different cable. However, just want to mention this T1 works just fine on 1841 rtr with DCU vwic.Unless, it is something special about 7200 with that 8-port T1 card that requires some special cabling.
The cat5e cable is acceptable, not optimal, as long the pinout and pairing is done per rj48c standards that are completely different from ethernet. That, is, you CANNOT take a patch cable for ethernet, straight or crossed, and expect to work for T1.
I'm not sure about the 1841, but as long the above is done correctly, the circuit will work fine.
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