Power over Ethernet Surge Protectors Manual Manual for SP077A
(Version 1) RS-232 Surge Protector, DB15 Manual Manual for
SP507A (Version 1) Black Box Explains...Power over Ethernet
(PoE). What is PoE? The seemingly universal network connection,
twisted-pair Ethernet cable, has another role to play, providing
electrical power to low-wattage electrical devices. Power over
Ethernet (PoE) was ratified by the... more/see it nowInstitute
of Electrical and Electronic Engineers (IEEE) in June 2000 as
the 802.3af-2003 standard. It defines the specifications for
low-level power delivery—roughly 13 watts at 48 VDC—over
twisted-pair Ethernet cable to PoE-enabled devices such as IP
telephones, wireless access points, Web cameras, and audio
speakers. Recently, the basic 802.3af standard was joined by the
IEEE 802.3at PoE standard (also called PoE+ or PoE plus),
ratified on September 11, 2009, which supplies up to 25 watts to
larger, more power-hungry devices. 802.3at is backwards
compatible with 802.3af. How does PoE work?