Path: utzoo!mnetor!uunet!yale!husc6!spdcc!eli
From: eli@spdcc.COM (Steve Elias)
Newsgroups: comp.dcom.modems
Subject: fax modems / 'normal' modems
Message-ID: <834@spdcc.COM>
Date: 12 Apr 88 13:10:09 GMT
Reply-To: eli@spdcc.UUCP (Steve Elias)
Organization: S.P. Dyer Computer Consulting, Cambridge MA
Lines: 48

{ posted for Jay Garvin...  my comments in squiggles...  please post comments. }

I've seen these new boards that you can plug into your IBM-PC which
will allow you to transmit Facsimilies, but is this board really
necessary?  Shouldn't you be able to transmit a fax using just your modem,
given the proper fax format and a special software program?

{ this would be nontrivial if not impossible, as far as i know.
  rockwell makes the only chipset that can speak fax...  }

Assuming that you *can*, I'd like to see if I could write such
software.  Do you know where I can find the formats and specifications
for facsimile transmission?  

     For example:

	* CCITT standards  { someone plz post address for CCITT }
	* U.S. standards   
	  { same as CCITT, for the most parts.  some companies are using
	    custom methods in order to transmit greyscale images.  a greyscale
	    method will be added by CCITT to the spec soon. }
	* File storage formats for graphics and text on the IBM-PC
	* Compression techniques for the data to be faxed
	  { included in CCITT spec.  run length & huffman codes. }
	* Group III, Group IV and all that....
	  { group 2 transmits entire bitmap / group 3 uses codes described
	    above / group 4 requires T1 medium }

I would be very grateful if you could point me to where I can find
where these specs are documented.  Especially an address or phone
number for the CCITT fax specifications....

Thanks!

-Jay


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| Jeffrey Jay Garvin              _                                          |
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