Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!mathcs.emory.edu!km
From: km@mathcs.emory.edu (Ken Mandelberg)
Newsgroups: comp.dcom.modems
Subject: Re: T2500's and v.32bis -- rumors?
Message-ID: <7178@emory.mathcs.emory.edu>
Date: 16 Mar 91 15:25:51 GMT
References: <1991Mar14.061634.14390@shaman.com> <28407@netcom.COM>
Sender: news@mathcs.emory.edu
Organization: Emory University, Dept of Math and CS
Lines: 37

In article <28407@netcom.COM>, gandrews@netcom.COM (Greg Andrews) writes:
|> >
|> 
|> 
|> Why no protocol spoofing in V.42?  Simple - the CCITT wasn't registering
|> extensions to the V.42 protocol when Telebit wanted to add protocol support.
|> Microcom was willing, so it was implemented in MNP mode.  There are some
|> "unregistered" extension codes available, but only at the risk of colliding
|> with someone else's private V.42 extension...  Telebit will keep checking
|> with the CCITT so spoofing can be added to V.42 mode also.
|> 

I had been wondering why on the T1600 the "remote access" commands only work
in MNP mode and not V.42. I guess the reason may be the same as suggested
above for spoofing.

****

By the way, I think its obvious why the upgrade path from the T2500 to
V.32bis can't be just firmware or a new daughter board, and will
probably be just some sort of discount on a new modem. The serial side
of the T2500 (on the motherboard) is apparently stuck at 19.2K max. It
doesn't seem to make much sense to signal at 14.4K with typically 2
fold and more compression, if you can't push it out of the back of the
modem at better than 19.2K. (If Telebit could have increased the serial
rate with firmware surely they would have already done that to be
competitive even with the current V.32/V.42BIS modems).

I think the more interesting question is will the T1600 get V.32BIS
with new firmware.


-- 
Ken Mandelberg      | km@mathcs.emory.edu          PREFERRED
Emory University    | {rutgers,gatech}!emory!km    UUCP 
Dept of Math and CS | km@emory.bitnet              NON-DOMAIN BITNET  
Atlanta, GA 30322   | Phone: Voice (404) 727-7963, FAX 727-5611