Gross number of input errors

[mdavis]

I have a 2600 series router connecting me to an Internet T1. Internet traffic going over this line is barely crawling along. The serial interface on the router is reporting a massive number of input errors, including CRC, frame, and abort errors. I had my ISP run some tests a few weeks ago, and everything came up clean. They informed me that it may be my router causing the issue. I swapped the WIC out, upgraded to the latest version of IOS supported by my hardware, and even swapped out the router itself, but nothing fixed the errors. I then had the ISP test again, and all tests were clean. What am I missing?

[thisisshanky]

What WIC is it ? WIC-1DSU-T1 or WIC-1DSU-T1-v2?

[mdavis]

How can I find out?

[sstudsdahl]

In the lower right hand corner of your WIC, right below the thumb screw, you should find the part number for the module.

Steve

[mdavis]

It's a WIC-1DSU-T1

[jphilope]

Have the carrier run a class-a line test. I just went through 6 weeks of the same issue. They tried to say it was my equipment as well. I was firm and complied with their request to change the T1 CSU/DSU. Didn't change a thing. Turned out to be bridge taps reflecting the signal and causing errors, interface resets, and lost carriers. Bridge taps are common. They don't show up on loop backs, nor most other telco tests. They only show up on an end-to-end test - the class-a (in the US).

Bet you it's the same kind of issue. Keep after the carrier. It's their problem.