Cisco Catalyst 4500 Series Configuration Manual page 613

Chapter 2
power inline four-pair forced
This command is available only on Supervisor Engine 7-E, Supervoisor Engine 7L-E, and Supervisor
Note
Engine 8-E.
To automatically enable power on both signal and spare pairs from a switch port, provided the end-device
is PoE capable on both signal and spare pairs but does not support the CDP or LLDP extensions required
for UPOE, use the power inline four-pair forced command.
Syntax Description This command has no arguments or keywords.
Command Default None
Command Modes
Interface configuration mode
Command History Release
15.0(2)SG
Usage Guidelines Although IEEE 802.at only provides for power up to 30W per port, the WS-X4748-UPOE+E module can
provide up to 60W using the spare pair of an RJ45 cable (wires 4,5,7,8) with the signal pair (wires
1,2,3,6). Power on the spare pair is enabled when the switch port and end-device mutually identify
themselves as UPOE capable using CDP or LLDP and the end-device requests for power on the spare
pair to be enabled. When the spare pair is powered, the end-device can negotiate up to 60W power from
the switch using CDP or LLDP.
If the end-device is PoE capable on both signal and spare pairs but does not support the CDP or LLDP
extensions required for UPOE, then the following configuration automatically enables power on both
signal and spare pairs from the switch port
Examples The following example shows how to automatically enable power on both signal and spare pairs from
switch port gigabit ethernet 2/1:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 2/1
Switch(config-if)# power inline four-pair forced
Switch(config-if)# shutdown
Switch(config-if)# no shutdown
Switch(config-if)# end
Switch#
power inline four-pair forced
Modification
This command was introduced on the Catalyst 4500 series switch using a
Supervisor Engine 7-E and 7L-E.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
power inline four-pair forced
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