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Cisco 2821 PTP - Error Sec / Slip Secs --

I have two dedicated T1's for Voice in a multilink to our main office where the IP Phone switch is located. 

I am getting sporadic complaints of muffled voices and I am seeing Error Secs and Slip Secs. I have opened a ticket with our provider and after 72hour monitor, they show the line as clean.  I believe it is a timing issue but I am looking for any guidance.  BTW - the circuits pulling timing from the line. 

See details below:

PhoneRTR#sh ver

Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(15)T13, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2010 by Cisco Systems, Inc.

Compiled Wed 07-Apr-10 11:28 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T11, RELEASE SOFTWARE (fc1)

PhoneRTR uptime is 1 year, 15 weeks, 5 days, 20 hours, 52 minutes

System returned to ROM by power-on

System restarted at 21:16:26 EST Thu Nov 18 2010

System image file is "flash:c2800nm-ipbase-mz.124-15.T13.bin"

Cisco 2821 (revision 53.51) with 514048K/10240K bytes of memory.

Processor board ID FTX1421AHCR

2 Gigabit Ethernet interfaces

2 Serial interfaces

2 Channelized T1/PRI ports

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

126976K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

PhoneRTR#sh inv

PhoneRTR#sh inventory

NAME: "2821 chassis", DESCR: "2821 chassis"

PID: CISCO2821         , VID: V07 , SN: FTX1421AHCR

NAME: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0 SubSlot 3", DESCR: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1"

PID: VWIC2-2MFT-T1/E1  , VID: V01 , SN: FOC14253E2S

PhoneRTR#sh controllers t1

T1 0/3/0 is up.

  Applique type is Channelized T1

  Cablelength is long 0db

  No alarms detected.

  alarm-trigger is not set

  Soaking time: 3, Clearance time: 10

  AIS State:Clear  LOS State:Clear  LOF State:Clear

  Version info Firmware: 20090408, FPGA: 13, spm_count = 0

  Framing is ESF, Line Code is B8ZS, Clock Source is Line.

  CRC Threshold is 320. Reported from firmware  is 320.

  Data in current interval (577 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 24 hours)

     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

T1 0/3/1 is up.

  Applique type is Channelized T1

  Cablelength is long 0db

  No alarms detected.

  alarm-trigger is not set

  Soaking time: 3, Clearance time: 10

  AIS State:Clear  LOS State:Clear  LOF State:Clear

  Version info Firmware: 20090408, FPGA: 13, spm_count = 0

  Framing is ESF, Line Code is B8ZS, Clock Source is Line.

  CRC Threshold is 320. Reported from firmware  is 320.

  Data in current interval (578 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

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

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

  Total Data (last 24 hours)

     0 Line Code Violations, 0 Path Code Violations,

    86400 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     86400 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

PhoneRTR#

PhoneRTR#sh int ser 0/3/0:0

Serial0/3/0:0 is up, line protocol is up

  Hardware is GT96K Serial

  Description: Voice Circuit

  MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation PPP, LCP Open, multilink Closed

  Open: CDPCP, loopback not set

  Keepalive set (10 sec)

  Last input 00:00:45, output 00:00:09, output hang never

  Last clearing of "show interface" counters 1w2d

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0o

  Queueing strategy: weighted fair

  Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations  0/2/256 (active/max active/max total)

     Reserved Conversations 0/0 (allocated/max allocated)

     Available Bandwidth 1152 kilobits/sec

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     167922 packets input, 7103398 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     7 input errors, 3 CRC, 1 frame, 2 overrun, 0 ignored, 1 abort

     167923 packets output, 7064123 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

  Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags

PhoneRTR#sh int ser 0/3/1:0

Serial0/3/1:0 is up, line protocol is up

  Hardware is GT96K Serial

  Description: voice Circuit

  MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 82/255, rxload 83/255

  Encapsulation PPP, LCP Open, multilink Open

  Link is a member of Multilink bundle Multilink123, loopback not set

  Keepalive set (10 sec)

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 1w2d

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: weighted fair  [suspended, using FIFO]

  FIFO output queue 0/40, 0 drops

  5 minute input rate 500000 bits/sec, 169 packets/sec

  5 minute output rate 498000 bits/sec, 164 packets/sec

     100382661 packets input, 521475873 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

    184614 input errors, 25777 CRC, 20657 frame, 78063 overrun, 0 ignored, 60117 abort

     97785369 packets output, 162135094 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

  Timeslot(s) Used:1-24, SCC: 1, Transmitter delay is 0 flags

PhoneRTR#

4 REPLIES

Cisco 2821 PTP - Error Sec / Slip Secs --

184614 input errors, 25777 CRC, 20657 frame, 78063 overrun, 0 ignored, 60117 abort

That many CRC errors in a week is too high. Have you just started seeing this problem or has anything changed recently?

HTH, John *** Please rate all useful posts ***

Cisco 2821 PTP - Error Sec / Slip Secs --

Here's a similar situation that I dealt with a couple of years ago and how I fixed it:

https://supportforums.cisco.com/message/819990#819990

Please rate if useful....

HTH, John *** Please rate all useful posts ***
New Member

Cisco 2821 PTP - Error Sec / Slip Secs --

No recent changes.  There have been a number of tickets regarding phone call quality -- I am chasing the issue now.  Thanks for the link -- I will test and let you know.

New Member

Cisco 2821 PTP - Error Sec / Slip Secs --

This put me on the right path - been dealing with this on a 2921 rtr for months.  Thank you thank you thank you j.blakley!!

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