sundance-communications.com/forum Forums TDM Business Telephone Systems Comdial Telephones & Systems Intermittent echo on DXP w/PRI

This has been an ongoing problem for several months. The initial complaint was occasionally when there was a voicemail left the person leaving the voicemail complained of echo. Next complaint was that occasionally (maybe a couple of times in a day) there was echo on a live call (different phones). Telco checked the circuit - NTF. I replaced the synch and PRI cards, trouble seemed to clear for a bit, then come back. I then adjusted the padding on the individual lines, again trouble seemed to clear, then slowly came back. Upon returning to the customer found the unlock LED lit on both the PRI and synch cards. Put the original synch card in and that cleared the unlock LED on the synch card but not the PRI. Put the original PRI card back in and the unlock LED is off. Also replaced the services board. Customer calls today (about 3-4 weeks after putting the original PRI/synch cards back in and replacing the services board) and says the echo is back. I am beginning to think that powering the switch down has had more to do with temporarily alleviating the echo than board replacement. Any ideas????

I usually have to pad the the B channels ~-2DB to prevent echo. Have you done this?

The B channels were set to gain 1, one site visit I dropped them to nominal, then another site visit to loss 1, where they are currently set.

Is this a qoute unqoute "normal PRI" In other words is it getting to you by just a smart jack or is it coming out of some type of router/data/IAD unit etc. Who is the carrier?

Jim Hoey

SST Communications
Long Island, NY

631 956 0100

I'd program for loss 2 and retry...

P.S. Jim Hoey- was good talking to you today. :toast:

Carrier is Centurylink (Embarq,Sprint....). Smartjack and has been in place for years.

Hi,

Same here. Nice to actually hear somebodies voice. I will see you at the dealer meeting I hope.

Onto the problem. Good it is traditional. Try the loss 2 and see if that helps.

Jim

Tried loss 2, same results. What tests, if any, can the telco do to determine if the problem is with their equipment? Would it be worth changing the aux board? At this point I am not even sure if the problem is with the DXP or the telco. I can change out all the cards I want and be chasing a ghost.

When in doubt change the services board. Alot going on with the services. If that does not help has the carrier switch to a "soft switch"

jim