Sudden bursts of input errors on a serial interface

[spfister]

Over the past couple of days, I've been notified of problems on a T1 to one of our upstream providers. The serial interface on the router (a 2621) will run fine for a while, then show a sudden burst of input and CRC errors, then be fine for a while again. I'm not sure where to start troubleshooting this. If I had a spare DSU module, I'd try swapping it out, but I don't.

Thanks

[msingla]

Hi Please refer to this link

or you provide us details some show commands output as well as debuggging messages then only problem could be isolated.Selective debugging you do and send us the o/p.

http://www.cisco.com/warp/public/116/T1_error.html

[deilert]

I would not suggest replacing your CSU/DSU. Call your provider and have them monitor the line to see if they see any errors on both ends . During some down time you can have them stress the line for a few hours .

[cabell911]

This has been an ongoing problem for me as well with the exception we are using the 56k CSU/DSU. Telco. shows no problems and I have switched out the WIC with Cisco as well to no avail. I'd be interested to know what you eventually find out. Good Luck.

JR