Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!amdahl!pyramid!prls!philabs!sbcs!root
From: root@sbcs.sunysb.edu (root)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit FAX mode?
Keywords: FAX, faxcico, uucp, UNIX
Message-ID: <1739@sbcs.sunysb.edu>
Date: 21 Oct 88 13:59:47 GMT
References: <597@pcrat.UUCP> <986@viscous> <600@pcrat.UUCP> <1924@van-bc.UUCP>
Organization: State University of New York at Stony Brook
Lines: 40

In article <1924@van-bc.UUCP>, sl@van-bc.UUCP (pri=-10 Stuart Lynne) writes:
> In article <600@pcrat.UUCP> rick@pcrat.UUCP (Rick Richardson) writes:
>
> There is at least one other manufacturer which has a fax modem chip set.
> Their name escapes me right now.
> 

	Yamaha has one that is reputedly $100 in Q100.

> >FAX, both incoming and outgoing.  Since Telebit has a modem that
> >is primarily implemented in software (as I understand it), they
	
	Actually, if you open up your telebit box you will see
	quite a bit of analog filtering stuff.  Perhaps someone from
	telebit can comment on whether this hardware filtering glop
	precludes doing fax (V.29) modulation on the 32010.

> >are the obvious people to do such a thing.  Of course, I suppose
> >I could get a DSP, do the PEP protocol and the FAX protocol all
> >myself.  But that's a lot more effort.

	Does anyone have a canned G3 compressor written in C?  If
	so given the Rockwell chipset you're pretty far along.

> With any luck they might even put the ASCII -> G3 conversion right into the
> modem! (Maybe even G3 -> ASCII :-) ). 

	No, you probably would not want this as it would increase the
	data rate requirement of the serial port by at least a factor
	of 2.  Since G3 max rate is 9600 baud (1200 bytes per second)
	you're pushing small machine serial ports at 19.2K or 38.4K if
	you decompressed in the modem.  Keep the image compressed until 
	it makes it onto the PC.

> 
> -- 
> Stuart.Lynne@wimsey.bc.ca {ubc-cs,uunet}!van-bc!sl     Vancouver,BC,604-937-7532

					Rick Spanbauer
					SUNY/Stony Brook