Odd problem that has been solved to discuss.
I had a customer with 2 routers connected by a full T1. Adtran TSU CSU/DSU
was splitting off 5 channels for voice and sending the rest to the router
for data. Routers had no connection to the voice. Data was down but voice
was working fine.
This was a working setup, not a new install.
Router A had a Up/up on the interface, was getting 22 byte packets in. No
input errors. Not seeing any IGRP packets. I could not ping the serial
interface on router B.
Router B had up/down on the interface, sending (22 byte packets) and I didnt
check if it was recieving packets, but getting lots of CRC input errors. If
I did a local loopback on the Nx56/64 port on the Adtran, I would come up/up
and ping myself with no CRC errors. If I pulled the T1 outta the smartjack
and put in a hardloop, I'd be up/down and getting CRC. Replaced the Nx56/64
module and all was well.
The question is, what is the 22 byte packets coming in? What conditions need
to be met for the protocol to go up? I've never seen it up/up and not have a
connection.
Scott Meyer
CCNA, CCDA, MCSE, etc
[EMAIL PROTECTED]
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