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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