[c-nsp] Ds3 Issues

[Justin M. Streiner]

>    I have one problem with one new Ds3 link, it always shows CRC errors
> and this show controller output

How far is the router from the mux that the telco is pulling the DS3 from?
Also, have you tried changing or re-terminating the coax cables that plug 
into your router?

Is this a point-to-point DS3?  If so, do you have access to the router at 
the other end, or could you have whoever manages that router get you the 
"show interface"/"show controller" outputs (or equivalents if the other 
end isn't a cisco box) to compare to yours?

Another test you can do is to unplug the DS3 from your router and connect 
the two ends together with a BNC barrel connector (or do this at the far 
end), set the line encapsulation for Cisco HDLC and fire some traffic down 
the link.

Also, in addition to the attenuation/buildout, check:
* timing configuration and source
* framing

The fact that you're getting C-bit coding violations makes me think that 
one side is set for c-bit framing (clear-channel DS3) and the other side 
is optioned for M13/M23 framing (channelized DS3), or it's a possible 
layer 1 problem.

jms

>   11017 Line Code Violations, 5613 P-bit Coding Violation
>   5360 C-bit Coding Violation
>   887 P-bit Err Secs, 0 P-bit Sev Err Secs
>   0 Sev Err Framing Secs, 0 Unavailable Secs
>   901 Line Errored Secs, 887 C-bit Errored Secs, 0 C-bit Sev Err Secs
> Total Data (last 1 15 minute intervals):
>   11017 Line Code Violations, 5613 P-bit Coding Violation,
>   5360 C-bit Coding Violation,
>   887 P-bit Err Secs, 0 P-bit Sev Err Secs,
>   0 Sev Err Framing Secs, 0 Unavailable Secs,
>   901 Line Errored Secs, 887 C-bit Errored Secs, 0 C-bit Sev Err Secs
>
>    It happens only against   the router, using Protocol Analyzers
> Equipment I always shows  OK.
>
>    Googling, I found a lot of forums writing about the issue  and
> advising to use one Cisco Ds3 Attenuator, but I can't find the Cisco Ds3
> Attenuator, so I'm thinking buy one * 75FP-XXX-2G BNC found on this URL
> http://www.rf-attenuators-dividers-terminations-switches.com/JFW_75ohm_Fixed_Products.aspx
>
> *
>
> *    Any Idea or comment will be appreciated..
> *
>
> *
> JC
> *
>
> **
>
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