[c-nsp] T1 Cables

[Vincent Aniello]

The serial interface shows input errors:

     39030 packets input, 5489247 bytes, 0 no buffer
     Received 1549 broadcasts, 79 runts, 0 giants, 0 throttles
     81 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 2 abort
     34658 packets output, 5285537 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

The T1 controller on the router is showing the following errors:

  Total Data (last 14 15 minute intervals):
     0 Line Code Violations, 2 Path Code Violations,
     0 Slip Secs, 3 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     3 Errored Secs, 0 Bursty Err Secs, 3 Severely Err Secs, 0 Unavail
Secs


Any insight as to what would cause these types of errors?

Thanks.

--Vincent



-----Original Message-----
From: David Coulson [mailto:david at davidcoulson.net] 
Sent: Friday, May 18, 2007 11:41 AM
To: Vincent Aniello
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] T1 Cables

Nope - Any old Cat5 will do the trick. If you're seeing errors on 
multiple circuits, and they're delivered on copper, it might be 
something telco related on the backend. They should be able to do tests 
against the NIU and CSU and establish if the issue is on the telco 
facilities or on the wiring between NIU and CSU.

What sort of errors are you seeing? Can they be explained by anything 
other than cabling, such as clocking issues and such?

Vincent Aniello wrote:
> Are there cables specifically for use with T1s that we should be using
> to connect circuits to our Cisco routers with integrated CSU/DSUs?  We
> currently use CAT5E cables and have chronic problems with errors on a
> few of our circuits.  The cable length between the smart jack and
router
> is 25 feet.
>   



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