dya@unc-c.UUCP (03/24/84)
<9 Wives presents....Norris>
In response to Mike Samuels request, here are some (
admittedly biased ) reviews on ultra-high speed modems...
The ULTIMATE dial up modem is the Universal Data Sys-
tems 9600 A/B ( which also works over 2 and 4 wire leased
circuits, but for 4 wire leased, use the 9600 Plain -- it's
probably cheaper ). This half-duplex insturment costs about
what the 2400 full duplex did about two years ago ( $ 2200 )
.
Unless you have AGC amplifiers which munch on the ini-
tal training burst, these modems connect and work every sin-
gle time. They have been successfully used over the entire
U.S. ( with the exception of a certain finicky area near
Buffalo, N.Y. -- see last article )and are more trouble-free
than my trusty Penril 212. UDS has a unique adaptive
equaliser which readjusts itself on the incoming data 9600
times per second. In addition, their product support is EX-
EMPLARY.
You may have seen a Prentice 9600 dial up modem
featured in Mini-Micro Systems ( or Electronic Design ? )
this month. It is, in fact, a UDS 9600 A/B with a new front
panel decal. They want $ 2995, UDS seems to want consider-
ably less.
OH yes, there is supposedly another 9600 bps dial-
through, they want $ 7,200 bucks for it, and all it does
more is that it is allegedly "intellegent" a la Hayes.
9600 A/B will fall back to either 7200 or 4800 by com-
mand from the host computer, ( of course, from 7200 to 4800
) and is settable to any of these rates.
The second modem which is high speed is the General Da-
taComm 208 A/B, which is 4800 bps only. They work, but their
product support is not nearly what UDS's is.
If you use async/sync converter, UDS's doesn't support
7200 bps. They do have one which uses ECC in addition, it
is highly recommended for the 9600 A/B by its manufacturer,
and not a bad deal for $ 600.
Views, etc. to ( akgua, decvax!mcnc!urp!dya )
David "Last of the Analog....."burton@fortune.UUCP (03/29/84)
#R:unc-c:-128100:fortune:8500005:000:165 fortune!burton Mar 28 12:35:00 1984 That's great, but how soon will Hayes come out with a 1200/4800/9600 modem that costs < $1000, and can be used on voice-grade lines. Is that possible technically?
spoo@utcsrgv.UUCP (Suk Lee) (03/30/84)
Yes, it's possible to run 9600 on
voice grade lines for <$1000 dollars.
A friend is working on such a thing
for his master's thesis. It uses a
signal-processor microprocessor to
implement an adaptive equalizer -- the
only way to get 9600 on voice lines.
If he gets the thing working, the
parts cost should be <$300
--
From the pooped paws of:
Suk Lee
..!{decvax,linus,allegra,ihnp4}!utcsrgv!spoosamuels@houxz.UUCP (M.SAMUELS) (04/17/84)
Sometime in late March, a review of some high speed modems was placed in this newsgroup from ...!unc-c!dya. I save all of the modem articles I read, but this one was eaten by the system - I only have a few lines from it. If anyone saved it, can it be posted again? Much appreciated. Mike Samuels houxz!samuels AT&T Bell Labs Holmdel, NJ