[c-nsp] POS Interface Alarm

[Clinton Work]

Your getting corrupted SONET frames in the end to end path (B3) layer.  
The router is alerting you that the bit error rate (BER) is exceeding 
the default threshold for BER.  Are you receiving the alarm constantly 
or only a couple of times a day?  I'm not familiar with the ASR syntax, 
but the IOS output from "show controllers pos0/0/0" would be helpful.  I 
would recommend that you contact your transport provider or group to see 
if they are seeing any errors on the circuit.  If you are getting a 
constant stream of alarms then I would recommend a hard loopback on each 
end to make sure that the router linecard/optics are not the culprit.  
Note, when doing the hard loopback you need to consider changing 
encapsulation to Cisco HDLC (If not already configured), clock source 
internal, and padding to prevent over driving your optical receiver.  If 
both ends run clean to a hard loopback then you need to work with your 
transport provider to do incrementing loopbacks to test each segment of 
the transport circuit.  If the alarms  / B3 errors are only trickling 
in, it can take a long time to isolate the location of the fault.


On 04/12/2011 06:51 PM, Righa Shake wrote:
> Am receiving the following error on my Cisco ASR POS Interface.
>
> %SONET-4-ALARM: SIP0/0:  POS0/0/0: B3 BER exceeds threshold, TC alert
> declared.
>
> Any help in finding a solution so as not to get the alarm will be
> appreciated.
>
>


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Clinton Work
Airdrie, AB