Path: utzoo!utgpu!water!watmath!clyde!bellcore!tness7!killer!vector!chip
From: chip@vector.UUCP (Chip Rosenthal)
Newsgroups: comp.dcom.modems
Subject: Re: BYTE high speed modem article and the Telcor Accelerator 2496MA
Message-ID: <347@vector.UUCP>
Date: 8 Jun 88 17:47:02 GMT
References: <12997@shemp.CS.UCLA.EDU> <1711@looking.UUCP> <431@dmk3b1.UUCP> <989@datapg.DataPg.MN.ORG> <1256@neoucom.UUCP>
Reply-To: chip@vector.UUCP (Chip Rosenthal)
Organization: Dallas Semiconductor
Lines: 23

In article <1256@neoucom.UUCP> wtm@neoucom.UUCP (Bill Mayhew) writes:
>I'd like to see ... how well modems stand up to over-voltage pulses on the
>phone/power line...  Several of the cheap modems we have seem to have died
>prematurely ..  presumably from line spikes.  One of the more amusing cheapie
>modems used two 1N4004 diodes connected back-to-back.

This doesn't make sense to me.  Any modem needs to have a DAA which meets
FCC part 68 approval before it can be hooked up to the public network.
Essentially, this verifies that the equipment can take a lightning bolt
and not blow up or harm the network.  I would tend to think that there
is a bit more energy in a lightening bolt than a line spike.

I assume your cheapie modem had a sticker with an FCC registration number.
Maybe you want to check and see if they are for real.

Disclaimer:  We sell a DAA, but I don't work on it, nor do I work on modem
products.  There could be very well be something different between the
requirements for modems and the requirements for the telecom gear I'm
more used to.
-- 
Chip Rosenthal /// chip@vector.UUCP /// Dallas Semiconductor /// 214-450-0400
{uunet!warble,sun!texsun!rpp386,killer}!vector!chip
I won't sing for politicians.  Ain't singing for Spuds.  This note's for you.