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Date:      Sat, 07 Oct 2006 20:35:28 -0700
From:      perryh@pluto.rain.com
To:        ahze@ahze.net
Cc:        freebsd-questions@freebsd.org
Subject:   Re: POE networking, what's the range?
Message-ID:  <45287200.T5d9wl44YUPWMOAf%perryh@pluto.rain.com>
In-Reply-To: <b2203fed0610071725s54a5805bo21cf79b11064f2d7@mail.gmail.com>
References:  <b2203fed0610071040y298b1b62wab8b5f57e795e5a3@mail.gmail.com> <20061007184515.GE65461@dan.emsphone.com> <452837d9.52OZSBB03ZtcOtzk%perryh@pluto.rain.com> <b2203fed0610071725s54a5805bo21cf79b11064f2d7@mail.gmail.com>

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> > The garage and the house are over 1/10 of a mile apart?
>
> yeah. it's not a car garage.
...
> I don't plan to string cable at all. Cable is already in place
> for all the electric stuff.

IOW the cat5 between the buildings is already in place?  In that
case, and supposing whoever put it in knew what s/he was doing,
the safety issues should have been taken care of.

There's still the matter of the 100m distance spec, but as others
have mentioned that is not a hard and fast rule in practice.
I have personally seen 10Base-2 (RG58 coax) work very well on a
segment that was well over twice the 200m maximum length specified
for that technology.  If 10/100Base-T are equally robust, you might
get by with a 200m run (esp. if you run only 10Mb over cat5, which
is capable of handling 100Mb, and/or if nothing else in the same
collision domain has anywhere near a maximum-length run).

I would guess that POE might still have problems, separate from
the Ethernet signal-distance limits, due to power loss in the
wiring.  The POE-powered device would likely have been designed
to allow for the loss in 100m of the cat 5 pair that's being used
to supply the power.  You've got about twice that distance, thus
about twice the voltage drop at any given current consumption.



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