[Asterisk-Users] phones with two ethernet ports

[Damon Estep]

Even worse, some two port 10/100 phones re-negotiate link speed on both
ports at the same time, dropping CALLS when you restart you PC!

There are some splitters you can use at both ends of the cat 5 cable (if
you do not use POE, as stated before). DAD1518 on google will lead you
to them, about $10 each ($20 per split cable). This allows the use of
dedicated ports on your switch.

A good strategy on a managed switch is to put your IP phones on a
dedicated VLAN with * to avoid some issues caused by high traffic loads
on the PC ports. This will prevent PCs (and viruses on them) from
impacting voice quality. This also requires considering the placement
and appropriateness of DHCP servers for VoIP phones. This strategy is
not possible when trying to use the integrated hubs on the phones.


> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Mitchel Constantin
> Sent: Monday, January 03, 2005 9:44 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] phones with two ethernet ports
> 
> I just wanted to point out something cool about the hub in the Cisco
> 7940 and 7960 (maybe others too). With the older SIP versions of the
> phones when you would restart them they would disconnect the
> workstation while they were rebooting, the newer SIP image on them
> uses a "Universal Boot Loader" that runs the image it downloads ontop
> of itself and thus can unload and reload it without restarting the
> phone and losing power to the workstation. This is very minor but
> somewhat annoying when your using your laptop plugged into the second
> port so you can use the lan connection to debug the phone.
> 
> Mitchel
> 
> 
> On Tue, 04 Jan 2005 14:30:43 +1100, Howard Lowndes
<lannet at lannet.com.au>
> wrote:
> > 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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