From owner-freebsd-questions@FreeBSD.ORG Sun May 31 08:38:51 2009 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5598C1065675 for ; Sun, 31 May 2009 08:38:51 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [IPv6:2001:4070:101:2::1]) by mx1.freebsd.org (Postfix) with ESMTP id 5DFC18FC16 for ; Sun, 31 May 2009 08:38:50 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1]) by wojtek.tensor.gdynia.pl (8.14.3/8.14.3) with ESMTP id n4V8chiE023252 for ; Sun, 31 May 2009 10:38:43 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from localhost (wojtek@localhost) by wojtek.tensor.gdynia.pl (8.14.3/8.14.3/Submit) with ESMTP id n4V8ch5a023249 for ; Sun, 31 May 2009 10:38:43 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Date: Sun, 31 May 2009 10:38:43 +0200 (CEST) From: Wojciech Puchar To: questions@freebsd.org In-Reply-To: <20090531032048.D884B5B29@marlborough.xo.com> Message-ID: References: <20090531032048.D884B5B29@marlborough.xo.com> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Subject: Re: Myths about Power Over Ethernet 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, 31 May 2009 08:38:51 -0000 > Myths about Power Over Ethernet > May 28, 2009 > Power-over-Ethernet (PoE) technology integrates power and data across standard Cat5/5e/6 network cabling and provides more flexibility in today?s workplace. PoE enables power to be supplied to network devices, such as IP phones, network cameras, and wireless access points through a single, most often existing, network cable. When combined with an uninterruptable power supply (UPS) a PoE network delivers continuous operation and minimizes business downtime by eliminating most power interruptions. With the ability to install endpoints in any location PoE technology provides a scalable and flexible networking infrastructure geared for growth and efficiency. Unless gigabit ethernet is used, the simplest PoE is to put + on brown pair and - on blue pair, as only green and orange pairs are used. Unless the device doesn't have low voltage like 5V or less as input and doesn't suck too much power it's just fine, and requires just 5-10 minutes or work, soldering iron and insulation tape. It's really funny to see "PoE converter" sets costing at least 150PLN (45$) here doing exactly the same. of course nobody forbids anyone to spent too much :) I even know somebody that had a lots of equipment with american-style power (110V AC), made 220 to 110V transformer and actually put 110V AC OVER CAT5 CABLE. It worked but really - it wasn't safe IMHO :)