Path: utzoo!attcan!uunet!tank!ncar!boulder!sunybcs!rutgers!tut.cis.ohio-state.edu!osu-cis!att!mtuxo!mtgzz!drutx!dvac
From: dvac@drutx.ATT.COM (Daniel Vachon)
Newsgroups: comp.sys.apple
Subject: Re: Ymodem-G (again?!)
Summary: 2400....slow
Message-ID: <8683@drutx.ATT.COM>
Date: 14 Sep 88 15:19:39 GMT
References: <8663@drutx.ATT.COM> <27636@think.UUCP> <8489@smoke.ARPA>
Distribution: comp
Organization: AT&T, Denver, CO
Lines: 21

In article <8489@smoke.ARPA>, gwyn@smoke.ARPA (Doug Gwyn ) writes:
> At normal modem speeds such as 2400 bps, there is so little gain
> in switching to a streaming protocol as to make it a waste of time
> to implement.  Do the calculations..

Well, I don't think it is a waste of time when you have a 9600 Baud 
modem, huh?  Do the calculations there....

With the USR 9600 HST, there is 9600 baud channel and a 300 baud
channel. the high speed channel is switched to the DCE that has the
most information to send.  So when doing a data transfer, if the 300
baud channel has to be switched to ACK a packet, it saves a lot of
time if the 9600 baud channel can stay with one DCE and just keep 
streaming out data....The only place you may incur an error with an HST
is between DCE and DTE, and usually that is a pretty reliable link.

True, it probably doesn't buy you a whole lot with 2400, but a lot of 
Apple BBS'ers are getting the USR HST's, and Ymodem or Zmodem would
be a great help in speed of data transfers.

Later -Dan Vachon-   ucbvax!ihnp4!drutx!dvac -or- !rutgers!moss!drutx!dvac