Issue connecting E1 to PBX

Unanswered Question
Jun 14th, 2007

I am trying to route our international calls from London to NY over our IP network. Call flow from London will be: Nortel Meridian > PRI card > Cisco Gateway PRI Interface > TDM to RTP conversion > Into QoS enabled London LAN > Via MPLS Network > Into QoS enabled New York LAN > Avaya Interface > Internal Avaya RTP to TDM conversion & vice versa.

I am currently stuck with configuring link between Cisco 2811 E1 interface (VWIC2-1MFT-T1/E1) and Nortel Meridian Option 61 PBX DDP2 (NT5D97AD) card.

Here is part of router config

card type e1 0 0

network-clock-participate wic 0

network-clock-select 1 E1 0/0/0

!

isdn switch-type primary-qsig

!

voice-card 0

no dspfarm

!

controller E1 0/0/0

linecode ami

pri-group timeslots 1-31

!

interface Serial0/0/0:15

no ip address

isdn switch-type primary-qsig

isdn overlap-receiving

isdn incoming-voice voice

isdn send-alerting

no cdp enable

!

voice-port 0/0/0:15

!

Here is output of some troubleshooting command:

LONQ-A-2811#show controllers e1

E1 0/0/0 is down.

Applique type is Channelized E1 - balanced

Transmitter is sending remote alarm.

Receiver has loss of signal.

alarm-trigger is not set

Version info Firmware: 20060707, FPGA: 13, spm_count = 0

Framing is CRC4, Line Code is AMI, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (704 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, 704 Unavail Secs

Total Data (last 24 hours)

175149 Line Code Violations, 89 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, 86400 Unavail Secs

LONQ-A-2811#

LONQ-A-2811#show isdn status

Global ISDN Switchtype = primary-qsig

ISDN Serial0/0/0:15 interface

dsl 0, interface ISDN Switchtype = primary-qsig

**** Slave side configuration ****

Layer 1 Status:

DEACTIVATED

Layer 2 Status:

TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x00000000

Number of L2 Discards = 0, L2 Session ID = 1

Total Allocated ISDN CCBs = 0

LONQ-A-2811#

Many Thanks,

Sasa

I have this problem too.
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kayih Thu, 06/14/2007 - 08:00

hi sasa,

I'm not an expert yet, but I believe your E1 interface is down. make sure there's no problem with your local service provider

LONQ-A-2811#show controllers e1

E1 0/0/0 is down

Layer 1 Status:

DEACTIVATED

sasaadamovic Fri, 06/15/2007 - 01:26

Hi Kyih.

Thanks for the post.

I have realised that my controller is down, but do not understand why. I have shecked and swapped cable with no luck.

We are connected to our PBX, no provider, and beleive that it is configured correctly, but if anybody can post an working example of PBX config it would be helpfull.

Regards,

Sasa

Paolo Bevilacqua Thu, 06/14/2007 - 09:47

hello,

please check cabling to your PBX. Note that AMI linecode is not common for E1, generally HDB3 is used. But before worrying about that, you must resolve the "Receiver has loss of signal." error.

sasaadamovic Fri, 06/15/2007 - 01:27

Hi p.bevilacqua ,

Thanks for the post.

I have checked and swapped cable with no luck.

We are connected to our PBX, no provider, and beleive that it is configured correctly, but if anybody can post an working example of PBX config it would be helpfull.

Regards,

Sasa

Paolo Bevilacqua Fri, 06/15/2007 - 01:32

Hi,

It's a cable problem, not a configuration issue.

What cable are ? you using? The PBX, what type of connector it has ? If RJ45, you must NOT use ethernet cable, but a custom made one with the crimp tool and plugs.

sasaadamovic Fri, 06/15/2007 - 01:39

Hi

It is RJ45 connection and I have tried ethernet and cross-over cables, so that is the cause of the problem. Do you know the pin setup for the custom cable? Can you point ne to a document please.

Thanks,

Sasa

Paolo Bevilacqua Fri, 06/15/2007 - 02:03

As I suspected :)

The pinout for the router is:

http://cisco.com/en/US/products/hw/routers/ps4062/prod_installation_guide09186a00801c9330.html#44346

The pinout for the PBX MAY or MAY NOT be the same. However, basically you have to cross TX with RX. The polarity of the TIP and RING within a TX and RX pair is not that important, but it would be very good if you can make the TX and RX to use a a twisted pair in the cable (color and matching color-striped indicate a pair)

You can ignore the shielding pins.

Let us know if it works and do not forget to rate useful post!

PS. If you never configured voip before it may take some patience to make it work. But at the end, it will. Ditto for making cables.

sasaadamovic Fri, 06/15/2007 - 04:03

Hi,

This was quite helpfull, but did not resolve problem.

I have created the cable and connected. Now I have some lights on the card:

CD: green

LP: None

AL: Orange

Controller E1 is sill down but message has changed from "Receiver has loss of signal." to "Receiver has loss of frame."

LONQ-A-2811#show controllers E1

E1 0/0/0 is down.

Applique type is Channelized E1 - balanced

Transmitter is sending remote alarm.

Receiver has loss of frame.

alarm-trigger is not set

Version info Firmware: 20060707, FPGA: 13, spm_count = 0

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

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (461 seconds elapsed):

3776051 Line Code Violations, 41524 Path Code Violations

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

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 461 Unavail Secs

Total Data (last 79 15 minute intervals):

29012523 Line Code Violations, 397427 Path Code Violations,

22 Slip Secs, 10 Fr Loss Secs, 10 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 65536 Severely Err Secs, 71100 Unavail Secs

LONQ-A-2811#

I have tried changing framing (CRC or NO-CRC) and linecodding (ani and hdb3) but no luck.

Maybe my cabling is still wrong?

Any ideas?

Cheers,

Sasa

Neither me or PBX guy ever configured any VoIP, but hope to learn :)

Paolo Bevilacqua Fri, 06/15/2007 - 05:30

Hi,

configure

controller e1 0/0/0

clock source internal

After that you should see controller up. Most likely is hdb3 / crc4,

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