Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!decwrl!vixie
From: vixie@decwrl.dec.com (Paul Vixie)
Newsgroups: comp.dcom.modems
Subject: DSP for V.32?
Message-ID: <23@jove.dec.com>
Date: 6 Nov 88 19:22:07 GMT
References: <1398@neoucom.UUCP>
Organization: DEC Western Research Lab
Lines: 23

# Anybody with DSP experience know if that TI DSP chip in the T1000
# is up to the task of implementing v.32?  

I don't have any DSP experience, but at the SLIP BOF at Interop '88, Mike
Ballard from Telebit said that the echo cancellation in V.32 was a very
hard problem to solve digitally and that it looked like it was going to
take two 32-bit DSP chips vs. the one 16-bit DSP chip they use today.
In addition to a 68020 or '030 instead of the '010 they use now.

It sounds like it's going to be expensive compared to a V.32-only modem made
with the new (Rockwell?) V.32 modem chip set.  But it'll do more, of course
-- stuff like SLIP framing and UUCP/Kermit/Xmodem spoofing and of course
we'll expect it to do PEP (at 28KB/sec!) and whatever USR HST's use.
Whether all that extra stuff will make the Telebit V.32 entry desirable
remains to be seen.

Personally, I'm not holding my breath for V.32.  The TB+ does everything I
want it to do; full-duplex at a lower speed solves no problem I happen to
have.
-- 
Paul Vixie
Work:    vixie@decwrl.dec.com    decwrl!vixie    +1 415 853 6600
Play:    paul@vixie.sf.ca.us     vixie!paul      +1 415 864 7013