I have a Cisco 3640 router that host 3 t1 circuits. 1 is to our frame, the other 2 load balance between a remote site. We have been seeing CRC/Framing errors on 1 of 2 circuits going to the remote site and have had the line tested clean. The CSU's are internal so cables are not an issue. From what I've read it sounds most likely to be a clocking issue but the configs look OK. Does anybody have any suggestions?
most of the time in point to point scenarios the carrier does not provide clock , have you verified from the carrier if they are providing clock?
Also is there an extended demarc at either side ?
Another thing you may want to do is have the carrier put up a monitor and monitor the port for a day or 2 then have them pull the port stats , your errors could be bursty and when they test they do not see the errors, more often than not it is a carrier issue ,
also find out where they are testing from
are they testing from the nearest dax if so have them move back as close to eith side then run to loops that you provide ,
If you do not have the service module configured to be able to be lop\oped remotely they will not be able to do it,service-module t1 fdl both is the command , if this is not on there there is no way they could have looped the csu
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