| Title: | -={ H A C K E R S }=- |
| Notice: | Write locked - see NOTED::HACKERS |
| Moderator: | DIEHRD::MORRIS |
| Created: | Thu Feb 20 1986 |
| Last Modified: | Mon Aug 03 1992 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 680 |
| Total number of notes: | 5456 |
Also posted in electro_hobby and usenet notes files
Many many moons ago I saw a very informative writeup on the line noise
you can get with a modem on a PBX or central office if the PCM clocks
are not in sync. Apparently the adding or discarding of bits causes a
phase 'hit' which shows up as a <DEL>{ on a 1200 baud modem. My modem
line started doing this last Thursday, and the telco is gonna look into
it (well, they are gonna do a 1KHz loss test to start with), but I
would really like to be able to find that article. ANyone know
what I am talking about and have a copy of the article? I'm not
sure if it was a USENET news group or a NOTES file, but I figgered
someone here might know. The telco repair guy seems to be very
helpful, I'd like to show him the article to explain where I think
the problem is...
Many thanks in advance.
Willie
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 445.1 | Please do tell! | ISWSW::DOOLITTAN | Primitive but effective | Wed Apr 15 1987 14:18 | 4 |
If you find it elsewhere, please mention it here. Sounds
like good info!
andy
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| 445.2 | COOKIE::KRANTZ | Thu Apr 16 1987 17:51 | 9 | ||
I remember the problem, (I never had it, but a friend did)
comes from TPC running diagnostics that can't be 'heard' but
that do screw up modems - are the appearances of the 'noise'
regular?
Try the PBX conference, or MODEMS or TERMINALS I believe I saw
something in one of those once upon a time...
Joe
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