What is the difference between PoE standard 802.3af (Mode A) and 802.3af (Mode B)?

There are currently two implementations of the IEEE 802.3af PoE standard; Mode A is powering the device over the data pins (1,2,3,6) on the Ethernet cable, and Mode B is powering the device over the spare pings (4,5,7,8) on the Ethernet cable. Trendnet devices use the IEEE 802.3af (Mode A) implementation.
FAQ ID: 1484
Created: 2/22/2008
Modified: 2/22/2008
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