Path: utzoo!mnetor!uunet!oddjob!hao!gatech!mcnc!uvaarpa!umd5!ames!elroy!spl1!richp1!robert
From: robert@richp1.UUCP (Robert Miller)
Newsgroups: comp.dcom.lans
Subject: Re: barrelled ethernet (yellow) coax
Message-ID: <95@richp1.UUCP>
Date: 4 Feb 88 15:15:11 GMT
Reply-To: robert@richp1.UUCP (Robert Miller)
Distribution: comp.dcom.lans
Organization: Rich Inc., Franklin Park, IL
Lines: 30
Keywords: cable length restriction
References:


In article <3559@batcomputer.tn.cornell.edu> padama@batcomputer.tn.cornell.edu (padama) writes:
>
>Given that the maximum length of an Ethernet segment is 500m, it used to 

This is true.

>be that the cable lengths used to make up this total had to be of one of three
>
>specified lengths..23.3m,70m, 117m. Has this restriction become obsolete, and can one now any arbitrary lengths of enet coax as long as the total does not exceed 500 m? Must the coax only be cut at the 2.5 m markings?

Never heard of this one.  Each segment must be 500m or less.  You
may connect several segments via a repeater or router of some sort.
Note however, that the max point-to-point distance between any two
nodes that you want to link should not exceed 1000m.  Also, there
should be a max of two repeaters/routers between any two nodes that
you want to link.

The nodes must be tapped/cut at the 2.5m markings( usually a black
ring painted on the yellow coax ) or you risk setting up standing
waves along the coax (coax is essentially a transmission line) that
will degrade the LAN's performance.


...............................................................................
"To open, cut along dotted line."
________________________________
                           _____\______________________________________________
			  /      |          Robert Miller @ ihnp4!richp1!robert
                         |       |
                          \_____/