Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Avaya CM DS1

Avaya CM DS1

Avaya CM DS1

I have a DS1 circuit that is down and I am trying to trouble shoot. It is a TN464F board configured as ISDN-PRI. The D channel in the Signal Group is in service. My question is this, when I connect a loopback plug to the integrated CSU for that circuit should the circuit show In Service when I status the trunk group? Since the data transmitted is looped to the receive pair the board should see this as a live circuit, correct or no?

RE: Avaya CM DS1

Do a test board + board number. All tests should pass. Post the outcome with the loopback plug and also when connected to the carrier. We might be able to help you.

Freelance Certified Avaya Aura Engineer

RE: Avaya CM DS1

I agree with G van Hamburg. Most likely the carrier has an issue and you need to open a ticket with them. You could also perform a 'list measurements ds1 summary board'. List measurements ds1 log will show you error counts in intervals.

RE: Avaya CM DS1


Test with LB and Test while connected to carrier are identical. All initial tests pass and then every channel fails/abort test 257.

Test with connection to carrier.

Test with LB in CSU.

RE: Avaya CM DS1

When you status the tkgp are the B channels down?

RE: Avaya CM DS1

Yes, all B channels are down but the signal group is in service operating on the secondary D channel.

RE: Avaya CM DS1

Does 'list measurements ds1...' show anything?
Have you reseated the board yet or swapped with another ds1?

RE: Avaya CM DS1

Has this every worked? I've seen this before on new install and had to 'change ds1' and set the protocol version to b.

RE: Avaya CM DS1

Lis meas shows a high count for UAF/FS. I haven't swapped or reseated boards yet because the entire trunk group went out at the same time, 5 circuits in all. The circuit I'm testing is just the first circuit in the trunk group. I assumed it wasn't my equipment and it had to be the carrier since all five circuits went out at the same time. The carrier is AT&T and they can't find any issue on their end. These circuits have been working for years, not a new install.

RE: Avaya CM DS1

Tell ATT to loop to your CSU(s) and run test patterns. I'm surprised testing the board didn't reveal anything but the measurements show issues and it would seem obvious that there is an issue with ATT.

RE: Avaya CM DS1

If the signal group is in service, try a busy and release of the trunk group. If it comes into service you may have an issue with the channel protocol and it may go out of service again. Ask your provider what type of central office switch you are connected to. A 4/5ESS will use protocol a on the DS1. A DMS 100/250 are different and a DMS500 can go either way. Also depends on your country. Check in the Screen Reference manual for the DS1 parameters. Of course the carrier may also have put the DS1 in lock-out.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close