Path: utzoo!attcan!uunet!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.dcom.lans
Subject: Re: UTP limit length, gives me problems for a 2 segment Ethernet conection
Keywords: UTP, 4 wires, Ethernet
Message-ID: <15745@cbmvax.commodore.com>
Date: 9 Nov 90 11:36:59 GMT
References: <1522@ariadne.csi.forth.GR>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Distribution: comp
Organization: Commodore, West Chester, PA
Lines: 27

In article <1522@ariadne.csi.forth.GR> nicolas@csi.forth.gr (Nicolas Chrissakis) writes:
>                  |||| <------- 4 wires (600 meters) under a road.
> I will like to connect the 2 Ethernet segments with these 4 wires.
> I can not put a repeater in the middle of the road and I want to have a
> 10 Mbit/sec connection.

I'm afriad that at 6 times the nominal length, over arbitrary wire there's
no chance that a twisted pair ethernet solution is going to work.  The
best you could do would be a cheap T1 bridge - if you can find one with a
a built-in dsu/csu capbiity you might be able to use it as a short-haul
modem, otherwise you'll have to go with the short-haul modem, something
like a RAD ASM-40 might be able to handle 1 or 2 MBit/sec over 600 M.

> I do not want to put a baseband modem at 128 Kbits/sec to have a connection.

If you can get up to the 1MBit/sec range, the whole works should seem faily
transparent, execpt for a heavily loaded net or on massive data transfers.

> Any suggestions?

Get someone to pull fibre-optic cable under the road...


-- 
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)