3Com 3CRBSG2893 User Guide - Page 500
PI, PD, Protocol Specification, Configuring PoE
UPC - 662705557137
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3Com Baseline Switch 2920-SFP Plus is a single PSE device, as so .this manual introduces the device with a single PSE only. A PSE can examine the Ethernet cables connected to PoE interfaces, search for PDs, classify them, and supply power to them. When detecting that a PD is unplugged, the PSE stops supplying power to the PD. PI An Ethernet interface with the PoE capability is called PoE interface. Currently, a PoE interface can be an FE or GE interface. The PSE supplies power for a PoE interface in the following two modes: z Over signal wires: The PSE uses the pairs (1, 2, 3, 6) for transmitting data in a category 3/5 twisted pair cable to supply DC power while transmitting data to PDs. z Over spare wires: The PSE uses the pairs (4, 5, 7, 8) not transmitting data in a category 3/5 twisted pair cable to supply DC power to PDs. 3Com Baseline Switch 2920-SFP Plus only support for signal mode. PD A PD is a device accepting power from the PSE, including IP phones, wireless APs, chargers of portable devices, POS, and web cameras. The PD that is being powered by the PSE can be connected to another power supply unit for redundancy power backup. Protocol Specification The protocol specification related to PoE is IEEE 802.3af. Configuring PoE Before configure PoE, make sure that the PoE power supply and PSE is operating normally; otherwise, you cannot configure PoE or the configured PoE function does not take effect. 1-2
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