Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 alpha 4/15/85; site leadsv.UUCP
Path: utzoo!linus!philabs!prls!amdimage!amdcad!cae780!leadsv!mfe
From: mfe@leadsv.UUCP (Mark Ellson)
Newsgroups: net.lan
Subject: Re: cable lengths, DELNIs, and more...
Message-ID: <460@leadsv.UUCP>
Date: Sun, 2-Jun-85 22:17:16 EDT
Article-I.D.: leadsv.460
Posted: Sun Jun  2 22:17:16 1985
Date-Received: Thu, 6-Jun-85 21:20:16 EDT
References: <2371@decwrl.UUCP>
Organization: LMSC-LEADS, Sunnyvale, Ca.
Lines: 24
Summary: A DELNI does not contribute to the length of the Ethernet cable; rather it contributes to the length of the tranceiver cable.

In article <2371@decwrl.UUCP>, waters@viking.DEC (Lester Waters) writes:
> 
> 	I've been recently installing an ethernet with many machines.
> Ive been reading ver. 2.0 of the DIX Ethernet specification, and found
> the various cable length/repeater restrictions placed on an ethernet.
> My question is: how does a DELNI impact this specification?

Referring to the DELNI Owner's Manual, you will find a table on page 35
which describes the impact that the DELNI has on cable lengths in various
configurations.  Basically, when using a DELNI to provide multiple
connections from a single tranceiver, the DELNI represents 15 meters of
tranceiver cable.  Thus the maximum distance from tranceiver to device is
reduced from 50 meters to 35 meters.

Similar boxes provided by other manufacturers have the same type of
restriction on the length of the tranceiver cable.  It is critical that you
find this specification for any unit you plan to use, and keep it in mind
while designing your network.

				Mark Ellson
				Lockheed Missiles & Space Co.
				ihnp4!amd!cae780  \
						   > !leadsv!mfe
				ucbvax!sun!sunncal/