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  Modems - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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 Post subject: Modems
Posted: Fri Dec 11, 2009 3:21 am 
 
Captain

Joined: Wed Sep 30, 2009 2:26 am
Posts: 6
I have a network with radyne satellite modems and Celtro compression equipment connected. There is one HUB with a DMT 4000 and 8 remote sites with DMT 1000 Celtro units. Some of the ciruits works fine, but one or two will work for about a week and then fail and also affect the working sites.

It looks like the buffer one one of the sites fills up and causes a failure.

I have changed the modems but the problem persists.

Do you have any suggestions to what the problem might be.

:smt119


 
   
 
 Post subject: Re: Modems
Posted: Fri Dec 18, 2009 12:16 pm 
 
Captain
User avatar

Joined: Mon Sep 01, 2003 6:59 pm
Posts: 22
Location: Boston
A simple question (maybe too simple): Have you verified that the software/firmware versions of the buffer-filled models are the same as the ones that work properly? Unless you swapped the bad ones with the ones that do not fail in operation (not just from a test bench), it is possible that the replacements have the same software/firmware as what they are replacing. If versions are inconsistent, it might even be an older version that is working correctly, so don't just assume the newer code is better.






Posted  11/12/2012

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