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Modems - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Please visit the new and improved RF Cafe Forums that were created in September of 2015. Unlike with the old forums where users registered individually, the new forums use a common User Name and Password so anyone can post without needing to create an account. Please find the current User Name and Password on the RF Cafe homepage. Thanks for your participation.

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

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.


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