I have an E1 going to PSTN on a 2621 XM router. I am getting a lot of the following errors. Line Code Violations and Path Code Violations. I have checked the Cisco site but the explanation is not very useful
Bipolar Violation (BPV) Error Event
A BPV error event for an alternate mark inversion (AMI)-coded signal is the occurrence of a pulse of the same polarity as the previous pulse. A BPV error event for a B8ZS- or HDB3- coded signal is the occurrence of a pulse of the same polarity as the previous pulse without being a part of the zero substitution code.
Excessive Zeroes (EXZ) Error Event
An EXZ error event for an AMI-coded signal is the occurrence of more than fifteen contiguous zeroes. For a binary 8-zero substitution (B8ZS) coded signal, the defect occurs when more than seven contiguous zeroes are detected.
Line Coding Violation (LCV) Error Event
An LCV is the occurrence of either a Bipolar Violation or Excessive Zeroes error event.
Path Coding Violation (PCV) Error Event
A PCV error event is a frame synchronization bit error in the D4 and E1-no cyclic redundancy check (CRC) formats, or a CRC error in the Extended Super Frame (ESF) and E1-CRC formats.
Does anybody have a better explanation? Could this relate to clock issue?
I had the same problem before, and here is what i was told:
If these routers have an AIM-voice-30 card and a T1 VWIC, add the following commands -
network-clock-participate wic 0
network-clock-select 1 t1 0/0
Assumes the T1 is in slot 0. If it is in slot 1 , make them as follows :
network-clock-participate wic 1
network-clock-select 1 t1 0/1
Without these commands, the AIM card does not sync itself to the clock signal that is recovered off the T1 line, so it essentially free runs, and can cause big problems with fax and modem calls. For normal voice calls the clock slips are generally imperceptible.
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