Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!asuvax!mcdphx!udc!feldman
From: feldman@urbana.mcd.mot.com (Mike Feldman)
Newsgroups: comp.dcom.modems
Subject: Re: severe line noise
Keywords: modem noise filter
Message-ID: <984@urbana.mcd.mot.com>
Date: 31 Aug 89 22:12:25 GMT
References: <434@tron.UUCP> <9411@chinet.chi.il.us>
Reply-To: feldman@urbana.mcd.mot.com (Mike Feldman)
Organization: Motorola Microcomputer Division, Urbana IL
Lines: 38

In article <9411@chinet.chi.il.us> ignatz@chinet.chi.il.us (Dave Ihnat) writes:
>The following is the distillation of an item entered here at 'chinet', a
>public access Unix system here in Chicago.
>
>Edward Lee wrote:
>I got the following file last year from CBBS #1.  The original 
>author was uncredited.
>_____________________________________________________________
>
>Modem Noise Killer (alpha version)
... long (and useful, thanks) message followed.

I have had terrible line noise problems at 1200 baud over long distance
connections from my father's house (rural), and this filter circuit may
help.  But my initial reaction was to look at error correcting modems,
since I've noticed a few new modems on the market for under $200 that
offer MNP class 5 error correction at 2400 baud.

From home to work (clean local call) I use an MNP class 3 modem (MultiTech
2400E), and I'm very happy with it, but  I haven't been able to find any
literature that confirms that MNP class 5 and class 3 are, as I suspect,
compatible in error correction, and you just don't get the class 5
compression.  Is this true?

Also, can anyone recommend any of the low-priced modems, eg. Practical
Peripherals?  My father's under $100 1200 baud modem-in-a-plastic-box
cooked itself in under 10 hours of use, and I don't want to see him or
me sink $$$s into that level of quality again.

Thanks,

Mike Feldman, Motorola Microcomputer Div., (217) 384-8538, FAX (217) 384-8550
Urbana Design Center	1101 East University Avenue, Urbana, IL   61801-2009
UUCP:  uunet!uiucuxc!mcdurb!feldman,	Internet:  feldman@urbana.mcd.mot.com
-- 
Mike Feldman, Motorola Microcomputer Div., (217) 384-8538, FAX (217) 384-8550
Urbana Design Center	1101 East University Avenue, Urbana, IL   61801-2009
UUCP:  uunet!uiucuxc!mcdurb!feldman,	Internet:  feldman@urbana.mcd.mot.com