Path: utzoo!utgpu!watserv1!watmath!att!att!dptg!ulysses!andante!mit-eddie!rutgers!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.dcom.modems
Subject: Re: Looking for High Speed Modem
Message-ID: <15264@cbmvax.commodore.com>
Date: 19 Oct 90 12:33:12 GMT
References: <90Oct18.214428edt.57509@ugw.utcs.utoronto.ca>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 23

In article <90Oct18.214428edt.57509@ugw.utcs.utoronto.ca> QWYELX@HUMBER.BITNET (Erone Quek) writes:
> 
> I am looking for a high speed modem (>512kbps) that will operate over
> 4-wire unloaded twisted pair (telephone cable) at a distance of 2.5 Km.
> 
> I have tried a pair of RAD/RND ASM-40, no luck.

You might try the RAD ASM-45, it seems a little less agressive and the
distance/speed curve might let you eek thru around 512KBPS / 2.5 KM,
while there's a good chance 256KBPS would work and be better than
nothing...

Beyond that, some T1 CSU/DSU devices can be used a short-haul modems 
but I suspect you get to about the same place on the distance / speed
curve and would need to add some kind of mid-line repeater.

I suppose there are problems with T1 (or equivalent) service,  microwave,
fiber links or other high-speed alternatives?

-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr@cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)