Configuring Power Over Ethernet - SMC Networks SMC TigerStack III SMC6824M Management Manual

Configuring Power over Ethernet

The 24 10/100 Mbps ports on the SMC6824MPE and SMC6826MPE
support the IEEE 802.3af Power-over-Ethernet (PoE) standard that
enables DC power to be supplied to attached devices over the unused pairs
of wires in the connecting Ethernet cable. Any 802.3af compliant device
attached to a port can directly draw power from the switch over the
Ethernet cable without requiring its own separate power source. This
capability gives network administrators centralized power control for
devices such as IP phones and wireless access points, which translates into
greater network availability.
A maximum PoE power budget for the switch (power available to all
switch ports) can be defined so that power can be centrally managed,
preventing overload conditions at the power source. If the power demand
from devices connected to the switch exceeds the power budget setting,
the switch uses port power priority settings to limit the supplied power.
In the example below, the power mainpower maximum allocation CLI
command is used to set the PoE power budget for the switch.
(Range: 37 - 375 watts). If devices connected to the switch require more
power than the switch budget, the port power priority settings are used to
control the supplied power. See "Setting a Switch Power Budget" on page
3-147 for details.
Console(config)#power mainpower maximum allocation 200
Console(config)#
PoE is enabled for all ports by default. Power can be disabled for a port by
using the no form of the power inline CLI command, as shown in the
example below.
Console(config)#interface ethernet 1/2
Console(config-if)#no power inline
Console(config-if)#
C P
ONFIGURING
E
OWER OVER THERNET
4-91
4-131
4-70
2-15