Re: Voice E1 errors

vinhnguyen · ‎03-29-2004

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?

Cheers

vinhnguyen · ‎03-29-2004

This is a show controllers e1 output

E1 1/0 is up.

Applique type is Channelized E1 - balanced

Description: to PABX

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20020812, FPGA: 11

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Internal.

Data in current interval (41 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 74 15 minute intervals):

4 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 3 Line Err Secs, 0 Degraded Mins,

3 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

E1 1/1 is up.

Applique type is Channelized E1 - balanced

Description: to PSTN

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20020812, FPGA: 11

Framing is CRC4, Line Code is HDB3, Clock Source is Line Primary.

Data in current interval (46 seconds elapsed):

3 Line Code Violations, 4 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 3 Line Err Secs, 0 Degraded Mins

3 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 74 15 minute intervals):

3099 Line Code Violations, 3699 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 2983 Line Err Secs, 0 Degraded Mins,

2982 Errored Secs, 110 Bursty Err Secs, 4 Severely Err Secs, 0 Unavail Secs

Andy.Chapman · ‎03-29-2004

Could you post your running-config? I have seen similar errors that were to do with clocking

Thanks

Andy

MARTIN STREULE · ‎03-30-2004

Hi,

If you have an AIM card, don't forget to configure from where it should take the clocking:

network-clock-participate wic 0

network-clock-select 1 E1 0/0

Hope, this helps you,

/Martin

azam_anwar · ‎03-30-2004

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.

The details are on this thread:

http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.eea48c8/1#selected_message

vinhnguyen · ‎03-30-2004

Hi all

My router don't have an AIM module see show ver

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-IS-M), Version 12.2(13)T11, RELEASE SOFTWARE (fc3)

TAC Support: http://www.cisco.com/tac

Compiled Wed 28-Jan-04 20:54 by eaarmas

Image text-base: 0x80008098, data-base: 0x818406D0

ROM: System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)

SW-W-04 uptime is 1 week, 1 day, 21 hours, 36 minutes

System returned to ROM by power-on

System restarted at 19:29:39 EST Mon Mar 22 2004

System image file is "flash:c2600-is-mz.122-13.T11.bin"

cisco 2621XM (MPC860P) processor (revision 0x100) with 92160K/6144K bytes of memory.

Processor board ID JAE07460JNC (2457436393)

M860 processor: part number 5, mask 2

Channelized E1, Version 1.0.

Bridging software.

X.25 software, Version 3.0.0.

Primary Rate ISDN software, Version 1.1.

2 FastEthernet/IEEE 802.3 interface(s)

21 Serial network interface(s)

2 Channelized E1/PRI port(s)

32K bytes of non-volatile configuration memory.

32768K bytes of processor board System flash (Read/Write)

The config is below (partial omission)

isdn switch-type primary-net5

!

voice call carrier capacity active

voice rtp send-recv

!

voice service voip

!

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

!

voice class h323 1

h225 timeout tcp establish 5

!

fax interface-type fax-mail

mta receive maximum-recipients 0

!

controller E1 1/0

framing NO-CRC4

clock source internal

ds0-group 1 timeslots 1-15,17-31 type r2-digital dtmf dnis

cas-custom 1

country australia use-defaults

description to PABX

!

controller E1 1/1

clock source line primary

pri-group timeslots 1-21

description to PSTN

!

interface Serial1/1:15

no ip address

no logging event link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn sending-complete

no cdp enable

voice-port 1/0:1

cptone AU

description "30 Channel "CAS" link to NEC2400 PABX"

!

voice-port 1/1:15

echo-cancel coverage 32

cptone AU

!

aperalta · ‎03-31-2004

Seems to be you have a framing mis-match/clocking problem (clocksource line) and may need to confirm settings and conditions of your circuit with your Telco.

Here are some links that you may find useful.

http://www.cisco.com/pcgi-bin/Support/browse/psp_view.pl?p=Technologies:T1T3E1E3&viewall=true

Regards,

Amador.-

richard.troman · ‎04-05-2004

looks like a framing or clock error. Its normal to take the clock from the line, you have it set to internal.