Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!purdue!bu-cs!xylogics!world!madd
From: madd@world.std.com (jim frost)
Newsgroups: comp.sys.ibm.pc
Subject: Re: MNP Level 5 Modems
Message-ID: <1989Oct26.160039.5630@world.std.com>
Date: 26 Oct 89 16:00:39 GMT
References: <32171@ucbvax.BERKELEY.EDU>
Reply-To: madd@world.UUCP (jim frost)
Organization: Software Tool & Die
Lines: 36

In article <32171@ucbvax.BERKELEY.EDU> kipnis@janus.Berkeley.EDU (Gary Kipnis) writes:
|Recently I bought Everex 2400 Baud MNP Level 5 Modem, and the manual said
|that if the other line supports MNP Level 5 protocol and if I have compression
|turned on, I can actually achieve higher transfer rates by increasing
|the transfer speed between computer and modem to say 4800 baud.

This speedup won't be to 4800 baud, although we got noticable
improvements -- something like 3500 baud -- for text.  There will
probably be a slight slowdown with compression if you are transferring
binary, but the reliability of MNP makes up for it; you will not loose
many packets when up/downloading software.

|The two questions are:
|How do I find out if the other line supports MNP Level 5 protocol and if
|it does how do I utilize this "speed up"

If you have your end enabled, it will respond with something like:

CONNECT 2400/REL

I'm not sure what the response is if you're not in verbose mode.  I
could go look it up but it's pretty immaterial.

The only thing you should have to do to utilize the speedup is use the
modem.  There are some caveats.  If one end or the other is talking to
the modem at (say) 2400 baud, throughput WILL NOT exceed 2400 baud.
Most MNP modems allow the host to talk to them at higher speeds (we
use 9600 baud between the host and the modem for our public dial-in
lines and the speedup from home is obvious and quite impressive).

Even if throughput isn't higher than 2400 baud, the reliability is
wonderful.

jim frost
software tool & die
madd@std.com