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Modems - RF Cafe Forums

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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.






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