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From: ABTSACS@UWLAX.BITNET (Dan Abts - UWL System/Network Manager)
Newsgroups: bit.listserv.novell
Subject: Re: ETHERNET PROBLEM
Message-ID: <20020109372777@lax.wisc.edu>
Date: 1 Feb 90 14:37:00 GMT
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>>This is taken from "International Standard, ISO 8802-3, ANSI/IEEE Std
>>802.3, First edition 1989-02-24", Section 10 on Type 10BASE2.  Under
>>10.7.2 Transmission System Requirements, "In order to maintain reflections
>>at an acceptable level, the minimum length cable section shall be 0.5m."

>Thanks for the authoritative answer.  Does this mean that there needs to be
>a .5m stub tacked on to the last PC on a segment.  We've been in the (possibly
>bad) habit of attaching a terminator directly to the T-connector on the last PC
>attached to an Ethernet segment.  We haven't noticed any problems, but every
>once in a while, there are unsolved mysteries on our networks.

We have 1 meter between each station and the terminator directly on the T.
This is what 3com recommended 6 years ago.

>I'd also be curious to hear about people's experiences in violating thin
>Ethernet cable distance restrictions, which officially call for segments of
>200 meters (about 650 feet).  There are several vendors, including 3Com, that
> claim to
>support segments of 1000 feet.  While we try to keep within spec, I know we
>have several thinwire Ethernets on campus that are in the 700-800 ft. range.
>How far as anybody tried to push these limits?  We've run RS-232 cable 1000 ft.
>at 9600 baud even though the spec says 50 ft.  Is there any comparison?
>
>Dave Molta
>University of North Texas

We have all 3com boards and have gone over 1200 feet with no problems.

Dan Abts
UW-La Crosse