Re: flexfax: "FIS answer timeout" *or* "No response to MPS or EOP" errors for USR Courier v34d

[Nico Garcia <raoul@cirl.meei.harvard.edu>]

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On Wed, 7 Jan 1998, David Birnbaum wrote:

> I've been laboring under the impression that Class 1 communication
> requires very tightly controlled timing of the communication between the
> computer and the modem that may not work properly if the machine gets
> loaded for some reason or the serial drivers are uncooperative.

This does not seem to have been a problem under SunOS: I suspect that
the problem is that more *computation* is done by the host, and that
correctly interrupt handling becomes more important. And since UNIX
is normally much better about handling interrupts than Microsoft's
DOS based systems, it can work quite well even under a somewhat loaded
server.

*EVENTUALLY* the server will crap out, but I've seen no difficulty
when I've tested a Class 1 modem on a moderately loaded Sparc LX.

			Nico Garcia
			Engineer, CIRL 
			Mass. Eye and Ear Infirmary
			raoul@cirl.meei.harvard.edu

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