Netgear GSM7228PS 7200 Series Managed Switch CLI Refernce Manual for Software - Page 266
Power Over Ethernet Commands
UPC - 606449071696
View all Netgear GSM7228PS manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 266 highlights
Chapter 5 Power Over Ethernet Commands This chapter provides information on the Power Over Ethernet Commands available in the GSM7228PS and GSM7252PS Switch software. The IEEE 802.3 Ethernet standard body has a task force called the 802.3af/802.3at, which specifies the method to deliver power over the LAN. 802.3af/802.3at, also known as Power over Ethernet, defines a way to build Ethernet power-sourcing equipment and powered terminals. The specification involves delivering 48 volts of AC power over unshielded twisted-pair (UTP/FTP) wiring. The current delivered to each node is limited to 350 milliamps. The total amount of continuous power that can be delivered up to 15.4W to each node, taking into account some power loss over the cable run, is 12.95 watts. The IEEE 802.3at PoE standard(ratified September 11, 2009), sometimes called "POE+", enhanced Power over Ethernet provides up to 30W to each node, taking into account some power loss over the cable run, 25.5 W is available to the PD. Power over Ethernet (PoE) is a technology that can integrate data, voice and power on a LAN. PoE supplies reliable, uninterrupted power to Internet Protocol (IP) telephones, wireless LAN access points, and other Ethernet devices that use existing Cat5 cables. Power over Ethernet, when used in conjunction with an uninterrupted power supply (UPS), ensures continuous operation during power failures. PoE saves time and eliminates the cost of installing separate power cabling and AC outlets. The power delivered over the Ethernet cabling is automatically activated when a compatible device is identified. The power is injected by either new generation Ethernet switches (end-Span) or by a dedicated patch-panel like device, residing between an ordinary Ethernet switch or hub and the terminals (mid-span). Mid-span devices are available with 1,6,12 or 24 ports. PoE technology does not degrade the network data communication performance or decrease the network reach. Wireless Access points often need to be located in high places, like the ceiling, where the necessary power lines and data access are not readily available. An integrated power-data network solves that problem and allows greater flexibility and range in wireless networking. In order for the network to carry power, you need to add power sourcing equipment (PSE). This is the source of power and the means to integrate that power onto the network. The PSE also provides a detection method for determining whether the Ethernet device on the other end of the cable, the Powered Device (PD), is 802.3af/at compliant or not. 5-1 v1.0, May 2010