Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mcgill-vision!iros1!vedge!lai
From: lai@vedge.UUCP (David Lai)
Newsgroups: comp.dcom.modems
Subject: Load adjusting modems -- can it be done?
Keywords: trailblazer, half duplex, v.32
Message-ID: <1653@vedge.UUCP>
Date: 20 Oct 88 16:45:56 GMT
Organization: Visual Edge Software, St. Laurent, Quebec
Lines: 21

The trailblazer modem slices up the bandwidth and adjusts the usage
of the bands depending on the line conditions.  I see the TB's main drawback
versus v.32 is that thrashes badly in full duplex operation.
So how about statistically allocating bandwidth for the
send/receive channels depending upon the load?

In other words, under an essentially half duplex operation (ie. one way file
transfer, or typical user on a keyboard), statistically more data will be sent
one way than the other, so allocate more bands to that channel.  When the
load characteristics are essentially full duplex (ie. two way file transfers),
then split the available bandwidth between the two channels.  This way one
still has the advantages of a fast half duplex modem, while not choking under
a full duplex load.  Make the algorithm similar to the line adjusting algorithm,
continuously adjustable depending on the load of each channel.

Sounds do-able, doesn't it?  Or am I forgetting something fundamental about
signal processing or telephony?  Anyone have comments?
-- 
	"What is a DJ if he can't scratch?"  - Uncle Jamms Army
The views expressed are those of the author, and not of Visual Edge, nor Usenet.
David Lai (vedge!lai@larry.mcrcim.mcgill.edu || ...watmath!onfcanim!vedge!lai)