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pm9600.txt
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1991-08-07
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Practical Modem 9600SA
Copyright 1991 David Batterson
There are innumerable PC users who are just now upgrading to 2400-bps
modems. For those thinking of doing so, you might consider buying a 9600-bps
modem instead. The increase in speed is impressive.
Prices of PCs and peripherals continue to drop as competition gets tougher
among manufacturers, wholesalers and retailers. The Practical Modem 9600SA
has a list price of $699 but one West Coast computer chain sells it for
$499.95. I expect the price to drop even more by year's end.
One reason for the reasonable price, as well as high-quality components,
is that the manufacturer uses Surface Mount Technology. The modems are all
manufactured in the U.S.
The PM9600SA, from Practical Peripherals, is a full-duplex V.32 9600-bps
modem. It features V.42 error-control, V.42bis data compression (with
automatic line-speed fallback), MNP levels 2-5 and ASB (Automatic Speed
Buffering).
ASB allows data flow from computer to modem at throughput rates up to
38,400-bps. Since both hardware (RTS/CTS) and software (XON/XOFF) flow
controls are supported, you shouldn't experience any data loss.
I especially liked the small footprint (3" W x 5" H x 10" D) of the
PM9600SA, since it fit easily on my extremely-crowded desktop. The modem is
fully compatible with all domestic (and most international) modem types,
including the Hayes Ultra Smartmodem 9600 and Smartcom III communications
software. You'd expect that because Practical Peripherals is a Hayes company.
I'm not a CompuServe subscriber but one of the BBSs I call supports 9600
baud (most major BBSs support 9600 now). Thus, I was able to test the
modem extensively at 9600 speed for a number of weeks.
That particular BBS uses a non-V.42 9600-bps modem apparently, since I
connected in MNP mode. You determine this by simply looking at one of the 10
LEDs on the front, labelled EC.
The EC (Error Control) is a multicolored LED. After you call and connect
in normal mode (with no error control), it displays red. A green display
indicates that V.42 error control (LAPM protocol) is active. An orange display
(which I saw) means you have MNP error control enabled and active.
The HS (High Speed) LED is also multicolored: off = 300-bps, red = 1200,
green = 2400 and orange = 4800/9600. The DC (Data Compression) LED lights up
if V.42bis or MNP 5 data compression is enabled.
Once I found out that the BBS always connected in MNP mode, I changed my
dialing prefix by adding the AT command, &Q8. By doing this, the modem doesn't
waste handshake time, trying to connect via V.42 mode first.
How kind of throughput did I get with the modem? While downloading ZIPped
mail packets from the BBS using ZMODEM ("DSZ MobyTurbo," to be exact), I
achieved over 1115 characters per second. Not too shabby!
I could log on, download the mail packet and log off, in less than a
minute. This rapid online access saves you time, and it creates more free
online time for others. Nobody likes a BBS hog.
BBS sysops (and others who want remote access) will appreciate the ability
to use a device to remotely power-up the PM9600SA. To do this, you change a
"Berg jumper" inside the case; no big deal to accomplish.
I don't know how much this means to you, but InfoWorld awarded the
PM9600SA its "1990 Modem Product of the Year" (based on a reader survey). The
modem comes with the usual Practical Peripherals five-year warranty. "If it
fails to perform, it will be repaired or replaced FREE," the company says.
This is the only 9600-bps modem I've reviewed so far. I experienced no
problems with it, and have no suggestions for improvements (unlike some other
products I've tested).
To borrow from Joe Bob Briggs: "5 stars, check it out." For more
information, contact Practical Peripherals, Inc., 31245 La Baya Drive, Westlake
Village, CA 91362; 818-706-0333; FAX: 818-706-2474.
#
David Batterson reviews various PC hardware/software. Contact him via
modem on MCI Mail: 273-7218.