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Started by Piers Lauder
Wed, 16 Sep 1992 07:44
12K / 12000 baud modems
Author: Piers Lauder
Date: Wed, 16 Sep 1992 07:44
Date: Wed, 16 Sep 1992 07:44
23 lines
1802 bytes
1802 bytes
There are many modems available containing the `rockwell' chip that supports
the (non-CCITT) 12000 baud connection protocol. This works well, giving a net
throughput with VCdaemon around 1150 bytes/sec (~1400 bytes/sec using MNP4).
However, none of the distributed call scripts know about this speed, and must
be modified to take advantage of it. Note that the modems must be connected
to their DTEs at 19200 baud, with hardware flow control (RTS/CTS) if possible,
to take advantage of the >9600 baud throughput. As with all >9600 baud modems,
if either end is using XON/XOFF flow-control, then the call script must specify
protocol "cooking" to escape the flow-control bytes ("-CX").
Some of the modems report
CONNECT 12K
and the call scripts need to be modified to match it.
Unfortunately, some report:
CONNECT 12000
and unless your script has been modified to match this first, it will instead
match against "CONNECT 1200", which won't work very well.
--
Computer Science, Sydney University, Madsen Bldg F09, Sydney NSW 2006
Phone: +61 2 692 3423 Fax: +61 2 692 3838
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