Path: utzoo!utgpu!attcan!uunet!portal!cup.portal.com!mhyman
From: mhyman@cup.portal.com (Marco S Hyman)
Newsgroups: comp.dcom.modems
Subject: Re: Who cares what it is, if it saves $$?
Message-ID: <11024@cup.portal.com>
Date: 7 Nov 88 16:54:03 GMT
References: <1398@neoucom.UUCP>
Organization: The Portal System (TM)
Lines: 18

In message <1398@neoucom.UUCP> wtm@neoucom.UUCP (Bill Mayhew) asks:
> Anybody with DSP experience know if that TI DSP chip in the T1000
> is up to the task of implementing v.32? ... I
> popped the cover off the Codex v.32 modem.  There were a whole bevy
> of DSP chips in there.  I think there were 6, but they were an
> older part type.

V.32 modems use the full bandwidth of the telephone line in both directions
and depend upon echo cancellation in the receiver to mask out what the modem
is sending.  Given that the echo may arrive at the receiver many milliseconds
after it left the transmitter with both phase and frequency shifts I can
believe it would take 4-6 DSPs to handle the job.  I don't think a PROM
update is going to change TBs to V.32 modems. 

--Marc
......
Marco S. Hyman			...!sun!portal!cup.portal.com!mhyman
				mhyman@cup.portal.com