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