lbert359@pallas.athenanet.com (Lee Bertagnolli) (11/17/90)
I have recently purchased a Digiboard C/X multiport board for use with my
little AT&T 6386E/20. The installation was fairly simple, and I am now
happily communicating with the world via the Digiboard, rather than the
clunky IPC board that came with the 6386E.
However, the increase in the rate of receiving data via Telebit T2500 modems
has not been appreciable. Whereas I was getting 800-900 cps receiving
data from uunet on the IPC, I am now getting about 1200 cps on the
Digiboard. Since the Digiboard is chock full of 16550s, supposedly with
their little FIFOs all enabled, I was expecting to push the T2500 near
its theoretical limit. This has not been the case.
On the transmit side, I am routinely sending data at speeds greater than
1600 cps, even with the IPC. Digiboard has been helpful, but they seem
stumped by the whole thing. I know some of you folks out there are
blasting away with Telebits, and that this whole issue has been beat
to death relative to FAS drivers and 16550s. What transmission speeds are
you experiencing, both sending and receiving, with systems equipped with
T2500s, uunet in particular? Do you have any ideas about this Digiboard?
Does anyone else out there have experience with the Digiboard C/X board?
--
+ Lee Bertagnolli + Voice: (217) 544-0270 +
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+ Springfield, Illinois 62704 + Internet: lbert359@athenanet.com +bill@unixland.uucp (Bill Heiser) (11/17/90)
In article <439@pallas.athenanet.com> lbert359@athenanet.com (Lee Bertagnolli) writes: >to death relative to FAS drivers and 16550s. What transmission speeds are >you experiencing, both sending and receiving, with systems equipped with >T2500s, uunet in particular? Do you have any ideas about this Digiboard? I am using a "generic" serial port board in a 386/25 machine. The board does not have the 16550 installed (once I find out where to get them, I'll order them). I get around 1250 cps inbound and 1500-1700 cps outbound T2500<->T2500. I am using the stock Esix driver. Bill -- home: ...!{uunet,bloom-beacon,esegue}!world!unixland!bill bill@unixland.uucp, bill%unixland.uucp@world.std.com Public Access Unix - Esix SYSVR3 - (508) 655-3848 other: heiser@world.std.com Public Access Unix (617) 739-9753
larry@nstar.uucp (Larry Snyder) (11/18/90)
bill@unixland.uucp (Bill Heiser) writes: >I am using a "generic" serial port board in a 386/25 machine. The board >does not have the 16550 installed (once I find out where to get them, I'll >order them). I get around 1250 cps inbound and 1500-1700 cps outbound >T2500<->T2500. I am using the stock Esix driver. The reason you think you are getting 1500-1700 cps outbound is that your bundles are small - and maybe uncompressed. Try sending large bundles of compressed data outbound - and I'll bet you you get around the same 1200 cps. We feed our sites news via compressed bundles averaging around 800k and throughput runs anywhere from 1200-1400 cps.. -- Larry Snyder, Northern Star Communications, Notre Dame, IN USA {larry@nstar, {uunet|backbone}!nstar!larry, larry%nstar@iuvax.cs.indiana.edu} backbone usenet newsfeeds available Public Access Unix Site (219) 289-0282 (5 high speed lines)