km@emory.uucp (Ken Mandelberg) (09/12/88)
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. Everex
says the list is $499.
If you know of a better 2400/MNP modem in this price
range, that information would also be appreciated.
--
Ken Mandelberg | km@mathcs.emory.edu PREFERRED
Emory University | {decvax,gatech}!emory!km UUCP
Dept of Math and CS | km@emory NON-DOMAIN BITNET
Atlanta, GA 30322 | Phone: (404) 727-7963ostroff@oswego.Oswego.EDU (Boyd Ostroff) (09/16/88)
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. > This sounds like the same modem as the Everex EMAC MD2400+ (which is the Macintosh version) - I suspect the only difference is the cable with which it is supplied. We can get these for $180 direct from Everex. I bought one several months ago and am generally quite happy with it. The MNP works well for me with the University's new modem pool. There are some nice features like a 200 character buffer, options for how the modem responds to loss of DTR, inactivity timer, etc, but NO non-volatile memory for storing defaults. 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 it setup with my AT&T 3B1 where my UUCP logs show an average throughput of about 210 characters/second. Note that this is *not* the same (often flamed) 2400 baud modem which Everex sold prior to February, 1988. Numerous problems were reported with these, but I have not experienced anything out of the ordinary. ::::::::::::::::::::::::::::::::::::::::: :: Boyd Ostroff, Technical Director :: System Operator, "The CallBoard" :: Department of Theatre, SUNY Oswego :: - Serving the performing arts - :: Internet: ostroff@oswego.Oswego.EDU :: (315) 947-6414, 300/1200 baud, 8N1 :: Voice: (315) 341-2987 :: UUCP ...sunybcs!oswego!cboard!ostroff :::::::::::::::::::::::::::::::::::::::::
jeff@drexel.UUCP (Jeff White) (09/19/88)
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
chip@ateng.ateng.com (Chip Salzenberg) (09/27/88)
According to jeff@drexel.UUCP (Jeff White): > [MNP] classes 4-5 incororate error compression (and >something else) which would increase the effective throughput of the modem. In fact, most errors can be compressed to nothing. -- Chip Salzenberg <chip@ateng.uu.net> or <uunet!ateng!chip> A T Engineering My employer may or may not agree with me. The urgent leaves no time for the important.