Power-Over-Ethernet Connections - SMC Networks TigerSwitch SMC6128PL2 Installation Manual

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Power-over-Ethernet Connections

The PoE switch automatically detects an 802.3af-compliant device by its
authenticated PoE signature and senses its required load before turning on
DC power to the port. This detection mechanism prevents damage to
other network equipment that is not 802.3af compliant.
Note: Power-over-Ethernet connections work with all existing Category
3, 4, 5, 5e or 6 network cabling, including patch cables and
patch-panels, outlets, and other connecting hardware, without
requiring modification.
The switch delivers power to a device using the two signal wire pairs in
UTP or STP cable (RJ-45 pins 1, 2, 3, and 6). The switch can provide up to
15.4 W of power continuously on each 10/100 Mbps port. However,
taking into account some power loss over the cable run, the amount of
power that can be delivered to a terminal device is 12.95 W. If a device
draws more than 15.4 W, from a port, an overload condition occurs and
the port turns off the power.
The switch controls the power and data on a port independently. Power
can be requested from a device that already has a data link to the switch.
Also, the switch can supply power to a device even if the port's data
connection has been disabled. The power on a port is continuously
monitored by the switch and it will be turned off as soon as a device
connection is removed.
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