Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken!sun-barr!olivea!oliveb!amdahl!netcom!gandrews
From: gandrews@netcom.COM (Greg Andrews)
Newsgroups: comp.sys.mac.comm
Subject: Re: Slow transfer rate on Telebit
Summary: Probably don't have protocol support turned on.
Message-ID: <28588@netcom.COM>
Date: 17 Mar 91 03:51:08 GMT
References: <13477@darkstar.ucsc.edu>
Organization: Netcom - Online Communication Services  UNIX System {408 241-9760 guest}
Lines: 29

In article <13477@darkstar.ucsc.edu> pete@saturn.ucsc.edu (Peter Hughes) writes:
>
>	I have a telebit T2500 9600-baud modem.  I dial into a Unix
>network using VersaTerm Pro.  Kermit gives me a transfer rate of about
>30 bytes/sec, less than 3% of line capacity.  Xmodem crashes.
>

Sounds like you're making the connection using the Telebit PEP
modulation, but you're not turning on the Xmodem or Kermit protocol
support.  Without protocol support enabled for the transfer protocol,
transfers are extremely slow.

Check the description of the S111 register in Chapter 5 of the modem's
manual.  Turning Kermit support on usually requires S111=10, turning
on support for Xmodem and Ymodem requires S111=20.

The modem can only enable support for one protocol at a time, so you need
to decide which one you want to use and set the register before you call.
Kermit is probably a little bit better than Xmodem and Ymodem because of
the features it has.  With the modem's protocol support turned on, Kermit
will run just as fast as Xmodem or Ymodem, so there's no disadvantage in
speed.  Choose the protocol that has the features you like best, turn on
support for that protocol in the modem, and transfer the files.


-- 
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| Greg Andrews      |   gandrews@netcom.COM |
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