From owner-freebsd-questions@FreeBSD.ORG Sun Oct 8 03:38:46 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 86E6C16A412 for ; Sun, 8 Oct 2006 03:38:46 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [199.26.172.34]) by mx1.FreeBSD.org (Postfix) with ESMTP id 332AF43D55 for ; Sun, 8 Oct 2006 03:38:46 +0000 (GMT) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id k983bPk3032292 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 7 Oct 2006 20:37:25 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id k983bPi0032291; Sat, 7 Oct 2006 20:37:25 -0700 (PDT) Received: from fbsd61 ([192.168.200.61]) by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA01342; Sat, 7 Oct 06 20:34:05 PDT Date: Sat, 07 Oct 2006 20:35:28 -0700 From: perryh@pluto.rain.com To: ahze@ahze.net Message-Id: <45287200.T5d9wl44YUPWMOAf%perryh@pluto.rain.com> References: <20061007184515.GE65461@dan.emsphone.com> <452837d9.52OZSBB03ZtcOtzk%perryh@pluto.rain.com> In-Reply-To: User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: POE networking, what's the range? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 08 Oct 2006 03:38:46 -0000 > > 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.