Formulas & Data:
- Electronics
- Mathematics
- Physics
- RF & Microwaves

Parts Vendors:
- all hand-selected

- Amateur Radio
- Vintage Articles:
- Electronics World
- Popular Electronics
- QST
- Radio & TV News
- Radio Craft
- Short Wave Craft
- Wireless World

- Events Calendar
RF Cafe Homepage
Copyright 1999-2015   •−•  ••−•    −•−•  •−  ••−•  •   "RF Cafe" in Morse Code  >> Listen to It <<
- EW & Radar Handbook
- Quizzes       - Software
- App Notes
- Calculators
- Advertise on RF Cafe
- About RF Cafe™
- RF Cafe Shirts & Mugs
- RF Cafe Archives
RF Cafe Book Contest
- RF Cafe on Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
- Tech Humor
- Forums Archive
- Job Board
- Donate to RF Cafe
- Kirt's Cogitations
Custom Search
More than 10,000 searchable pages indexed.
Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it. Thanks!

Modems - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 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

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website