[Asterisk-Users] phones with two ethernet ports

[Howard Lowndes]

On Tue, 2005-01-04 at 15:06, Lyle Giese wrote:
> 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?

What is the spec for PoE anyway?

> 
> 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;
> > when you want a system that just works, you choose Microsoft."
> > ------------------------------------------
> > "Flatter government, not fatter government;
> > Get rid of the Australian states."
> >
> >
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-- 
Howard.
LANNet Computing Associates;
Your Linux people <http://www.lannetlinux.com>
------------------------------------------
"When you just want a system that works, you choose Linux;
when you want a system that just works, you choose Microsoft."
------------------------------------------
"Flatter government, not fatter government;
Get rid of the Australian states."