8-8
Software Configuration Guide—Release 12.2(25)SG
OL-7659-02
Chapter8 Configuring Power over Ethernet
The 802.3af-compliant PoE modules can consume up to 20 W of PoE to power FPGAs and other
hardware components on the module. Be sure to add at least 20 W to your PoE requirements for each
802.3af-compliant PoE module to ensure that the system has adequate power for the PDs connected to
the switch.
The example below displays the PoE consumption for an 802.3af-compliant module using the show
power module command.
The “Inline Power Oper” column displays the amount of PoE consumed by th e powered devices that are
attached to the module, in addition to the PoE consumed by the FPGAs and other hardware comp onents
on the module. The “Inline Power Admin” column displays only the amount of PoE allocated by the
powered devices attached to the module.
Note The operating PoE consumption for an 802.3af-compliant module c an be non-zero, even when there are
no powered devices attached to the module, because of the PoE consumed by FPGAs and other hardware
components on the module. In addition, the operating PoE can vary due to fluctuations in the PoE
consumed by the hardware components.
Switch# show power module
Watts Used of System Power (12V)
Mod Model currently out of reset in reset
---- ----------------- --------- ------------ --------
1 WS-X4013+TS 330 330 330
2 WS-X4548-GB-RJ45V 60 60 20
3 WS-X4548-GB-RJ45V 60 60 20
-- Fan Tray 30 -- --
----------------------- --------- ------------ -------
Total 480 450 370
Watts used of Chassis Inline Power (-50V)
Inline Power Admin Inline Power Oper
Mod Model PS Device PS Device Efficiency
---- ----------------- ---------------- ---------------- ----------
2 WS-X4548-GB-RJ45V 138 123 73 65 89
3 WS-X4548-GB-RJ45V 0 0 22 20 89
----------------------- ---------------- ---------------- ----------
Total 138 123 95 85
Watts used of Module Inline Power (12V -> -50V)
Inline Power Admin Inline Power Oper
Mod Model PS Device PS Device Efficiency
---- ----------------- ---------------- ---------------- ----------
1 WS-X4013+TS 128 128 63 63 100
----------------------- ---------------- ---------------- ----------
Switch#
The example below displays the PoE consumption for an 802.3af-compliant module using the show
power detail and show power inline commands.
The “Inline Power Oper” column displays the amount of PoE consumed by th e powered devices that are
attached to the module, in addition to the PoE consumed by the FPGAs and other hardware comp onents
on the module. The “Inline Power Admin” column displays only the amount of PoE allocated by the
powered devices attached to the module.