RE: [SLUG] [OT] repeaters & hubs ##

[George Vieira <georgev@nospam.citadelcomputer.com.au>]

I was told that the cable length limit was the longest 2 cable ends from
point to point. So if you had 30 cables plugged into a hub and the longest
cable was 80 meters and the second longest was 50 then you would have gone
over the limit length by 10 metres right??? Makes sense in a way but doesn't
make sense or may not apply to your diagram...
As it is effectively one network, you have 500 meters there from node 1 to
node 2....

What's the go?

thanks,
George Vieira
Network Administrator
Citadel Computer Systems P/L
http://www.citadelcomputer.com.au



-----Original Message-----
From: DaZZa [mailto:dazza@nospam.zip.com.au]
Sent: Monday, 5 June 2000 12:33 PM
To: Ben Donohue
Cc: slug@nospam.slug.org.au
Subject: Re: [SLUG] [OT] repeaters & hubs ##


On Mon, 5 Jun 2000, Ben Donohue wrote:

> > You can extend your network using hubs as well - as long as you apply
the
> > 5-4-3 rule to the total segment length and number of repeaters.
> 
> Okay, what's the 5-4-3 rule?

{groans} I knew someone'd ask me that.

It goes something like you can extend your maximum network cable length by
extending it across 5 hubs with 4 segments and any 3 of those segments
being populated {I.E. having nodes on them}.

In other words, you can use either hubs or repeaters to make your maximum
network length extend from 100 metres {for 10BaseT} to 500 metres in this
kind of diagram.

[PC_NODE]
   | 
   | 100 metres of cable
[HUB]
   |   
   | 100 metres of cable
[HUB]
   |   
   |---[PC_NODE]
   | 100 metres of cable
   |
[HUB]
   |
   | 100 metres of cable
[HUB]
   |
   | 100 metres of cable
[PC_NODE]


Notice that only three of the segments are populated {the first, the one
in the middle and the last}, and that there are only 4 segments in the
middle of the network. Note that this is ALL the same network - in other
words, all devices connected to it are in the 192.168.1.x address range -
there is no routing happening.

The drawing is crappy, I know, but it should demonstrate the general
principle.

It's been 10 years since I've bothered with it, so this might not be exact
anymore - I'd have to dig out my reference manuals to find the exact
definitions. I'm working from a very hazy memory here, because most of the
projects I work on either use routers {which invalidate the rules by
changing things to different segments}, or which are designed so you don't
need that much length on any one cable run.

DaZZa

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