Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!rpi!crdgw1!sixhub!davidsen
From: davidsen@sixhub.UUCP (Wm E. Davidsen Jr)
Newsgroups: comp.dcom.modems
Subject: Re: Sharp 2400 modem claims 9600
Message-ID: <1716@sixhub.UUCP>
Date: 13 Sep 90 01:08:26 GMT
References: <15267@shlump.nac.dec.com>
Reply-To: davidsen@sixhub.UUCP (bill davidsen)
Organization: *IX Public Access UNIX, Schenectady NY
Lines: 16

In article <15267@shlump.nac.dec.com> sreekanth@rgb.dec.com (Jon Sreekanth) writes:

| Anyone know what this is all about ? Is the 9600-bps the MNP-derived
| advantage, or are they really hacking the protocol in some way ? 
| 9600 full duplex for arbitrary data (not by compression, that is)
| for $299 sounds too good to be true .... 

  This is technically possible. The PEP protocol runs 511 channels at 7
baud (yes!) each, while typical 2400 is 600 baud with 4:1 bit/baud
mapping. I really don't want to get into the theory here, but the answer
is (a) it can be done, and (b) I have no idea how well they did it.
-- 
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
    sysop *IX BBS and Public Access UNIX
    moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me