Those 22 bytes would probably be the keepalive for HDLC if that's what
you're running. Interface would only go up/up if layer 1 & 2 is good,
in the case of HDLC it will need to see keepalive from the other end.
"debug serial interface" on both end would be a good one to check
this.
Personally, I
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
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