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From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Newsgroups: comp.dcom.modems
Subject: Re: A Fidonet review of 9600 bps modems
Message-ID: <494@omen.UUCP>
Date: Sun, 15-Mar-87 19:20:19 EST
Article-I.D.: omen.494
Posted: Sun Mar 15 19:20:19 1987
Date-Received: Mon, 16-Mar-87 04:48:19 EST
References: <KPETERSEN.12286054237.BABYL@SIMTEL20.ARPA>
Reply-To: caf@omen.UUCP (PUT YOUR NAME HERE)
Distribution: world
Organization: Omen Technology Inc, Portland Oregon
Lines: 21

:     favor.  With that 300 baud channel,  file transfer protocols like
:     XMODEM, and more importantly SEAlink will work just fine.

The 300 bps reverse channel isn't the same as that on a 103 modem, which
uses a relatively wide bandwidth in the prime segment of the phone
line's bandpass to acheive a low error rate.

The reverse channel is used for management of the error correction
protocol used by the modems, and is not immediately available to send
user's data as it is with a 103 modem.  The end result (with repect to
turnaround delays) would resemble an MNP modem operating at 450 bps, and
would not give the expected throughput.

So don't throw away your ZMODEM source code.

Chuck Forsberg WA7KGX Author of Pro-YAM communications Tools for PCDOS and Unix
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