[Asterisk-Users] phones with two ethernet ports

[Lyle Giese]

Who uses hubs anymore?  These rules don't apply to switches.  These rules
were needed because of time delay with collisions.  Switches don't propagate
collisions, but rather isolate them.

And correct me if I am wrong, but are not the other two pairs used for PoE
now?

Lyle

----- Original Message ----- 
From: "Howard Lowndes" <lannet at lannet.com.au>
To: <asterisk at vanderdecken.com>; "Asterisk Users Mailing List -
Non-Commercial Discussion" <asterisk-users at lists.digium.com>
Sent: Monday, January 03, 2005 9:30 PM
Subject: RE: [Asterisk-Users] phones with two ethernet ports


> On Tue, 2005-01-04 at 10:08, Race Vanderdecken wrote:
> > Each 4-pair wire has 8 wires in the "blue wrapper" cable.
> >
> > You only need 2 pairs, 4 of the wires, for 100MB Ethernet.
> >
> > You could split the wire at the wall jack and at the switch end where it
> > goes through the punch down thingy (the name escapes me at the moment.)
> >
> > You only need to run 1 blue/4 pair wire cable to each desk. You could
> > put a small hub on each desk to split our more sockets.
> >
> > For the life of me I will never understand why people believe that each
> > cubical/desk needs it own 4-pair cable, CAT5 cable connect back to the
> > server.
>
> There are limits to this idea of hubs, in that you can only cascade so
> many.  If I remember rightly it's called the 5,4,3,2,1 rule.
>
> 5 segments, 4 hubs, 3 populated, 2 unpopulated, make 1 network.  No
> doubt someone will correct me if I am wrong :)
>
>
> -- 
> Howard.
> LANNet Computing Associates;
> Your Linux people <http://www.lannetlinux.com>
> ------------------------------------------
> "When you just want a system that works, you choose Linux;
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>
>
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