Slipping PRI - Fix in sight?

Unanswered Question
Apr 14th, 2004

We have a customer with a slipping T1 circuit that I can't seem to nail down.

It's not only slipping, please see the errors list below.

T1 1/0 is up.

Applique type is Channelized T1

Cablelength is short 133

Description: PSTN Facing PRI

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20031216, FPGA: 11

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

CRC Threshold is 320. Reported from firmware is 0.

Data in current interval (500 seconds elapsed):

20 Line Code Violations, 20 Path Code Violations

1 Slip Secs, 0 Fr Loss Secs, 8 Line Err Secs, 3 Degraded Mins

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

Total Data (last 92 15 minute intervals):

1631 Line Code Violations, 4633 Path Code Violations,

107 Slip Secs, 999 Fr Loss Secs, 608 Line Err Secs, 232 Degraded Mins,

917 Errored Secs, 252 Bursty Err Secs, 2 Severely Err Secs, 1002 Unavail Secs

As you can see it's not TOO dirty but it's enough that the users are noticing clicks and noise. Protocols are of course correct, provider has complete an end to end test of the circuit and they see no issues. VG200 gateway running 12.3.6 We have changed the entire gateway, upgraded IOS, changed WIC's.

Thoughts?

I have this problem too.
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ehaseki Wed, 04/14/2004 - 10:38

Hi,

Maybe you tried but, the main reason for the errors on the PRI interfaces is the clock source. Did you try to change the clock source for that PRI interface?

Regards.

Erdem.

eyabane Wed, 04/14/2004 - 13:43

I would top Erdem by confirming the clock could be one of the sources of the problem.

also, check along the lines of the physical media:

- bad cabing

- any kind of inteference along the cables

Eyabane

rbradfield Wed, 04/14/2004 - 17:24

you don't mention the IOS revision or hardware you are using, I say this because there was aproblem with AIM dsps in 2600s last year which was fixed by an IOS upgrade

Richard.

rbradfield Wed, 04/14/2004 - 17:30

Sorry ignore my last post, did not read the bottom of your original

you might want to look at these commands or something similar

network-clock-participate wic 1

network-clock-select 1 T1 0/1

justin.cohen@in... Mon, 04/19/2004 - 05:41

The router is clocking off the line. The provided did an end to end test and saw no errors.

The commands you mentioned I know about on the 26xx platform, such as 2651xm, but for the VG200 those commands don't seem to exist (even though it is of course just a crippled 26xx)

Any other ideas?

dradovan Mon, 04/19/2004 - 07:00

Justin,

have you tried increasing the cable length? This won't probably do much for you but...

Also, what else do you have in that VG200? Send us show diag. This must be one of those "telco's sending a signal that is too strog" cases.

Dragi

mcnerney@uwyo.edu Mon, 04/19/2004 - 07:44

If the telco says they have tested the circuit and found no errors, then I would tend to agree. But here is what they tend to do. The extend a circuit from their central office to your location and install a NIU. They then connect a Bert tester to the circuit from the CO end, send an electronic signal to the NIU that loops the NIU. Then the conduct a Bert analysis of the circuit. This confirms the condition of the circuit from the CO to the NIU. What it doesn't do is check the output (or customer side of the NIU). I've found that the NIU can be faulty on the customer side or in some cases the NIU is not provisioned correctly and sends a signal way to strong. In either case you receive erros. What I would do is loop the far end of the circuit. If you have a CSU this can be as easy as looping the CSU, if no CSU then loop the end of the cable. If you terminated onto an RJ45 plug then just loop pins 1,2 to 4,5. Then call the telco back and have them conduct another test to confirm that the circuit is indeed running clean from the CO all the way to your end. Another thought came to mind here. You might also double check with the telco and confirm that the circuit is provisioned like you think it is (ESF and B8ZS)?. If you both aren't provisioned the same you will see what appears to be errors on the circuit.

Good luck.

justin.cohen@in... Mon, 04/19/2004 - 09:32

The loopback was from the customer side. That's the odd thing, the circuit is extended to the premist by a fibre loop, on site there is a fibre loop converter that goes into the NIU unit, out of the NIU and into us.

justin.cohen@in... Mon, 04/19/2004 - 08:28

SHOW DIAG

Slot 0:

VG200 1FE Mainboard Port adapter, 1 port

Port adapter is analyzed

Port adapter insertion time unknown

EEPROM contents at hardware discovery:

Hardware Revision : 6.0

PCB Serial Number : xxxxxxxxxxx (0)

Part Number : 73-4742-02

RMA History : 00

RMA Number : 0-0-0-0

Board Revision : A0

Deviation Number : 0-0

EEPROM format version 4

EEPROM contents (hex):

0x00: 04 FF 40 00 94 41 06 00 C1 0F 4A 41 44 30 36 31

0x10: 32 30 4D 36 30 20 28 30 29 82 49 12 86 02 04 00

0x20: 81 00 00 00 00 42 41 30 80 00 00 00 00 FF FF FF

0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

Slot 1:

High Density Voice Port adapter

Port adapter is analyzed

Port adapter insertion time unknown

EEPROM contents at hardware discovery:

Hardware Revision : 1.1

Top Assy. Part Number : 800-03567-01

Board Revision : G0

Deviation Number : 0-0

Fab Version : 02

PCB Serial Number : xxxxxxxxxxx

RMA Test History : 00

RMA Number : 0-0-0-0

RMA History : 00

EEPROM format version 4

EEPROM contents (hex):

0x00: 04 FF 40 00 CC 41 01 01 C0 46 03 20 00 0D EF 01

0x10: 42 47 30 80 00 00 00 00 02 02 C1 8B 4A 41 44 30

0x20: 36 33 35 30 4A 4B 57 03 00 81 00 00 00 00 04 00

0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

VIC Slot 0:

T1 (2 Port) Multi-Flex Trunk (Drop&Insert) WAN Daughter Card

Hardware revision 1.0 Board revision B0

Serial number 27352435 Part number 800-04614-03

Test history 0x0 RMA number 00-00-00

Connector type PCI

EEPROM format version 1

EEPROM contents (hex):

0x20: 01 24 01 00 01 A1 5D 73 50 12 06 03 00 00 00 00

0x30: 58 00 00 00 01 12 17 00 FF FF FF FF FF FF FF FF

HDV firmware: Compiled Tue 10-Sep-02 19:12 by richc

HDV memory size 524280 heap free 142049

dradovan Mon, 04/19/2004 - 09:06

You said you'd tried to find network clock commands on your vg200 but there weren't any. vg200 is a strange animal.

Check the clocking again (although it's a pri, and clocking is line, you never know), and also run a debug isdn q921 to see what is going on.

justin.cohen@in... Mon, 04/19/2004 - 10:31

I am not too familar with the output results from the q921.

Here is what i'm seeing.

3w4d: ISDN Se1/0:23 Q921: User RX <- INFO sapi=0 tei=0, ns=57 nr=57

3w4d: ISDN Se1/0:23 Q921: User TX -> RR sapi=0 tei=0 nr=58

3w4d: ISDN Se1/0:23 Q921: User TX -> INFO sapi=0 tei=0, ns=57 nr=58

3w4d: ISDN Se1/0:23 Q921: User RX <- RR sapi=0 tei=0 nr=58

3w4d: ISDN Se1/0:23 Q921: User RX <- INFO sapi=0 tei=0, ns=58 nr=58

3w4d: ISDN Se1/0:23 Q921: User TX -> RR sapi=0 tei=0 nr=59

3w4d: ISDN Se1/0:23 Q921: User TX -> INFO sapi=0 tei=0, ns=58 nr=59

3w4d: ISDN Se1/0:23 Q921: User TX -> INFO sapi=0 tei=0, ns=59 nr=59

3w4d: ISDN Se1/0:23 Q921: User RX <- RR sapi=0 tei=0 nr=59

3w4d: ISDN Se1/0:23 Q921: User RX <- RR sapi=0 tei=0 nr=60

3w4d: ISDN Se1/0:23 Q921: User RX <- INFO sapi=0 tei=0, ns=59 nr=60

3w4d: ISDN Se1/0:23 Q921: User TX -> RR sapi=0 tei=0 nr=60

3w4d: ISDN Se1/0:23 Q921: User RX <- INFO sapi=0 tei=0, ns=60 nr=60

3w4d: ISDN Se1/0:23 Q921: User TX -> RR sapi=0 tei=0 nr=61

3w4d: ISDN Se1/0:23 Q921: User TX -> INFO sapi=0 tei=0, ns=60 nr=61

Is there something specific I should be looking for?

justin.cohen@in... Mon, 04/19/2004 - 12:37

Here is a complete config...

Switch type is DMS-100

version 12.3

no parser cache

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

!

boot-start-marker

boot-end-marker

!

logging buffered 4096 debugging

no logging console

!

memory-size iomem 15

voice-card 1

codec complexity medium ecan-extended

!

no aaa new-model

ip subnet-zero

ip tcp synwait-time 13

!

!

isdn switch-type primary-dms100

!

voice call carrier capacity active

voice rtp send-recv

!

voice service voip

!

!

!

!

!

!

!

!

!

ccm-manager redundant-host 10.17.200.10 10.17.110.10

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 10.17.200.10

ccm-manager config

!

!

controller T1 1/0

framing esf

clock source line primary

linecode b8zs

cablelength short 133

pri-group timeslots 1-24 service mgcp

description PSTN Facing PRI

!

controller T1 1/1

shutdown

framing esf

linecode b8zs

cablelength short 133

pri-group timeslots 1-24 service mgcp

!

interface FastEthernet0/0

description Plug into Voice VLAN 110

ip address 10.17.200.14 255.255.255.0

speed 100

full-duplex

!

interface Serial1/0:23

no ip address

no logging event link-status

isdn switch-type primary-dms100

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn channel-id invert extend-bit

no cdp enable

!

interface Serial1/1:23

no ip address

no logging event link-status

isdn switch-type primary-dms100

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn channel-id invert extend-bit

no cdp enable

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.17.200.1

no ip http server

!

!

voice-port 1/0:23

input gain -3

output attenuation 3

echo-cancel coverage 32

!

voice-port 1/1:23

input gain -3

output attenuation 3

echo-cancel coverage 32

!

mgcp

mgcp call-agent 10.17.200.11 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

!

mgcp profile default

!

!

!

dial-peer voice 1 pots

application mgcpapp

!

dial-peer voice 1123 pots

application mgcpapp

!

!

end

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Posted April 14, 2004 at 6:06 AM
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