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From: v082mv5d@ubvmsd.cc.buffalo.edu (William M Utter)
Newsgroups: comp.misc,comp.periphs,comp.sys.misc
Subject: Re: ** Help Needed on Modem Selection **
Message-ID: <56917@eerie.acsu.Buffalo.EDU>
Date: 30 Jan 91 17:05:53 GMT
References: <1991Jan21.204216.27162@engin.umich.edu>
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In article <1991Jan21.204216.27162@engin.umich.edu>, chau@caen.engin.umich.edu (Hin Fai Chau) writes...
>I have seen an ad in the January issue of Computer Shopper about the V.42bis
>external modem by Zoom for a price of $189.  It claims that it can achieve
>9600 bd compressed through-put with a 2400 bd data-pump; fully V.42 COMPLIANT,
>100% Hayes and MNP-5 compatible.
> 


>(2) What do V.42, V.42bis, Hayes and MNP-5 mean?
	V.42 and MNP are methods of error correction and DATA compression.
  MNP5 can make you modem go "twice" as fast.  throughput up to 4800bps on
  a 2400 modem.  v.42 is a much better compression and might get you 9600.
  I have both a USR 2400 MNP5 modem and I would say that average throughput
  is about 3600bps.  I also have a USR HST modem with v42.  I can notice the
  difference in a mnp5 and v.42 connection.  Even when connected at 14400.



>(4) What is the limit of ordinary phone lines?  Can it handle 9600 baud data
>    transmission?

	I use the USR HST on regular phone lines.  I have heard that there
  might be some problems in Europe but I haven't seen any here in the states.
  No problems with long distance calls either.  One ince thing about MNP/v.42
  is that you will never have LINE NOISE.