I learned yesterday that Cisco only truly supports 4 T1s in a 2821. I have 3 WICs in a 2821 (6 T1s) and it's been "working" fine. I noticed that I've been incurring CRC errors on ALL 6 of my interfaces. I've contacted the local telco, and they tested their line clean. I then had them come out and test from demarc to them, and it tested clean.
All of the connections are individual frame links that are bundled on my end. My question is:
If Cisco only supports 4 T1s coming into the router, and I have 6, will I a.) get CRC errors (normally line issue) and b.) will I see them only on the cards that's having a problem or will it be just local to the card that's having a problem.