Here is my problem. I am atempting to connect my 2821 with an HWIC-4T to my 2801 with a WIC-1T via a standard T1 PTP leased line.
After a router reboot or an interface shut / no shut the link will come up momentarily and then drop. I have tested the line and all the CSU/DSU equipment in the link by temporarily using another WIC-1T in the 2821 and the link comes up and it stable.
I need to use the HWIC-4T due to needing the port density for an upcoming expansion.
Sounds like a timing issue. If this is a poing to point T1 one end must provide timing. If you are using the same external CSU/DSU's this might not be a problem, but if you are not you need to make sure one end is providing timing.
The other thing to check is to make sure you have HWIC-4T and not a HWIC4-AS. The reason this matters is because the AS only goes up to 256K.
If this does not work if you could post config info it would help.
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