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echo: lan
to: JONATHAN HUNTER
from: GEORGE WHITE
date: 1997-11-04 08:37:00
subject: Arcnet

Hi Jonathan,
You asked Hal Roney:
JH> JH>> How far, just out of interest?
JH> HR> Oh man. I was afraid you'd ask.  This is the only topology that's
JH> HR> SPECed in FEET and the one I always forget as well.  I think
JH> HR> it's....2000' from active hub to W/S or hub, and 100' from pasive hub
JH> HR> to W/S, and a total of 20,000'. So, given enough active hubs (they 
ct
JH> HR> as repeaters and passive hubs do not) a little better than 3.5 MILES
JH> HR> or about 6 KiloMeters. IE. a LONG way away, for a LAN!
JH>:-))) I've now got as far as getting my "development" box
JH>up and running with Arcnet and Ethernet cards in it, but
JH>I'm now stuck on the physical cabling side for Arcnet.. Do
JH>I use T-pieces and terminators, as in Ethernet??
Think of the basic wiring for a small ARCNET system as being the same as
for a small 10BaseT Ethernet system, with coax replaceing the twisted
pair cable. You were given the wiring for a passive hub, cable length is
a max of 200' (60m) between any two nodes (or just use a max of 100'
from hub to node) with a passive hub.
JH>So far, the green light on the card (LINK?) is on
JH>permanently, but the red light (DATA??) just flashes every
JH>second or so :-( BTW - there are no other machines on this
JH>LAN yet..
Make sure you set each card to a different address. The Arcnet specs
require card IDs to be physically set by switches (or possibly links)
on the card. Arcnet is a token passing network.
JH> JH>> "development" Linux box, with Arcnet and Ethernet cards in, so I'll
JH> JH>> use that a router between the two networks.
JH> HR> Sounds COOL!  On paper anyway.
JH>I hope it will be... An interesting experiment, anyway, and
JH>possibly useful if I ever want a network link to next door
JH>or something (probably too far for Ethernet).
If you require the full specified Arcnet cable length you'll need an
active hub (if you can find one).
George
 * SLMR 2.1a * A mainframe: The biggest PC peripheral available.
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