Hi
B3 errors are definetly NOT from a dirty fiber ....
B3 is a bit which is set in the SONET frames (i believe), so the B3
comes from your carrier or the POS card is broken.
What is your carrier? I know that there was a problem with DWDM
equipment in the past at our carrier. There was a failure in their
bandwidth manager, which causes that the value of the "B3 bit" as
swapped without any reason.
Do you also see these B3 threshold exceeds on "the other end" of the
circuit?
Have you had a look in the Bugwatcher on CCO?
Rgds
Andre
> -----Original Message-----
> From: tishi@ziplink.net [mailto:tishi@ziplink.net]
> Sent: Dienstag, 19. September 2000 21:46
> To: cisco-nsp@puck.nether.net
> Subject: SONET-4-ALARM everyday
>
>
> Hi all,
>
> I am getting syslog entries listed below everyday.
> I had a TAC case but all I got from CISCO was "it's a dirty fiber".
> If that is the case, how a dirty fiber affects us everyday
> almost at the same time? I contacted a SONET provider,
> they told me that "we do not see any hit". I also see lots of
> PATH errors.
>
> any suggestions?
>
> -tishi
>
> >>>>
> Sep 14 04:44:55 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 14 04:46:44 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> Sep 15 04:44:56 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 15 04:46:45 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> Sep 16 04:44:57 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 16 04:46:46 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> Sep 17 04:44:59 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 17 04:46:48 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> Sep 18 04:44:59 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 18 04:46:48 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> Sep 19 04:45:00 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER
> exceeds threshold, TC alarm declared
> Sep 19 04:46:49 EDT: %SONET-4-ALARM: POS5/0/0: B3 BER below
> threshold, TC alarm cleared
> <<<<
>
>
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