Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!decwrl!labrea!rutgers!bpa!drexel!jeff
From: jeff@drexel.UUCP (Jeff White)
Newsgroups: comp.dcom.modems
Subject: Re: Everex EV-945A
Summary: Shouldn't have seen any throughput improvement
Keywords: MNP
Message-ID: <716@drexel.UUCP>
Date: 18 Sep 88 21:30:58 GMT
References: <3186@emory.uucp> <930@oswego.Oswego.EDU>
Organization: Drexel University, Phila., Pa.
Lines: 19

In article <930@oswego.Oswego.EDU>, ostroff@oswego.Oswego.EDU (Boyd Ostroff) writes:
> In article <3186@emory.uucp> km@emory.uucp (Ken Mandelberg) writes:
> >Can anyone comment on experience with the Everex EV-945A?
> >Its a 2400 baud MNP (Class 3) external modem. We can get
> >them locally for $180 which seems like a bargain. 
> >
>  ...
> 
> I don't see any noticeable throughput improvement with MNP turned on, though
> I do get a "cleaner" connection.  I've used it with my Mac and now have

  From my understanding of the MNP protocol, classes 1-3 does async to sync
conversion (strips start and stop bits) and also adds the error detection.
I think the affective increase at this stage is 5 to 9 percent (ie. throughput
is 109% of a non MNP modem).  Classes 4-5 incororate error compression (and
something else) which would increase the effective throughput of the modem.

						Jeff White
						Drexel University - ECE Dept.
						rutgers!bpa!drexel!jeff