Path: utzoo!attcan!uunet!samsung!usc!zaphod.mps.ohio-state.edu!mips!ultra!marke
From: marke@ultra.com (Marke Clinger - NorthWest District SE - Ultra Networks)
Newsgroups: comp.dcom.lans
Subject: Re: How long can you run ethernet?
Message-ID: <1990Jun14.210052.7813@ultra.com>
Date: 14 Jun 90 21:00:52 GMT
References: <90164.140927KDM101@psuvm.psu.edu>
Reply-To: marke@ultra.com (Marke Clinger - NorthWest District SE)
Organization: Ultra Network Technologies
Lines: 38

I have seen some conflicting lengths which I would like to make sure
get cleared up.  I have the DEC/Intel/XEROX Ethernet Specification
sitting on my lap...an excerpt.....  This is talking about the Thick
Ethernet that has been mentioned.  I believe all of the numbers for
thin have been right and without conflicts:

1)      A coaxial cable, termincated in its specified characteric
	impedance at each, can be a maximum of 500 Meters of coaxial
	cable.

2)	A maximum of 2 repeaters in the path between any two stations.
	Each Repeater counts to the maximum number of nodes/stations
	on a network.  Use to extend the length of the channel and to
	extend the topology from 1 to 3 dimensional.

3)	A maximum of 50 meters of transceiver cable between any
	station and its associated transceiver. (ie the station can be
	at most 50m from the coax cable as the drop cable goes)

4)	A maximum aggregate of 1000 meters of point-to-point links
	between any two stations in the system.  

5)	A maximum of 100 stations per segment.

If you are going to be implementing Ethernet, I recommend getting a
copy of the Ethernet specification.  DEC bookstores sell it.  The one
I have says:

	The Ethernet, Version 2.0, November 1982, AA-K759B-TK

The Pamphlet recommended in a previous posting is also very good and I
think DEC has this also.

Marke Clinger
Systems Engineer
Ultra Network Technologies	(The Gigabit Network)

marke@ultra.com