3Com Switch 7750 Configuration Guide

722 CHAPTER 64: POE CONFIGURATION
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■ You can successfully enable PoE on a module only when the remaining power
of the switch is not less than the full power of this module.
■ The required power of PDs may exceed the power configured for them due to
their unstable status, thus causing the PDs connected to the last port on the
module to be powered off. Therefore, when you configure the maximum
power value for a module, ensure enough power for all ports of the module
and reserve additional 20 W power for instant high power at the same time.
■ Once PoE is enabled on a module, the system reserves the power for the slot
even after you remove the module from the slot; in this case, you can use the
undo poe enable slot command to release this power.
■ The reserved power for a blank slot will be recycled automatically by the system
if you insert a PoE-incapability module into the slot. The reserved power for a
blank slot will still be distributed to the slot if you insert a different type of
module into the slot and the module is PoE-enabled.
■ Before you enable the PoE-compatibility detection on a module, you must first
enable PoE on this module with the poe enable slot slot-num command.
■ When PoE-compatibility detection is performed on non-standard devices, the
system performance will be affected. When standard 802.3af devices are
connected to the module, you are not recommended to enable the
PoE-compatibility detection feature.
Setting the PoE Feature
of a PoE Port
Enable the compatibility
detection feature for remote
PDs of the board
poe legacy enable slot
slot-number
Optional
By default, compatibility
detection is disabled for PDs.
Table 581 Configure the PoE feature of a PoE-enabled board
Operation Command Description
Table 582 Set the PoE management mode and PoE priority of a port
Operation Command Description
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Enable the PoE feature poe enable Required
By default, the PoE feature is
enabled on a port when the
PoE feature is enabled on a
module.
Set the maximum power
supplied by the port
poe max-power max-power Optional
By default, the maximum
power supplied by the port is
15.4 W.
Set the power supply mode of
the port
poe mode { signal | spare } Optional
The Switch 7750 support only
the signal mode.
Se the PoE priority of the port poe priority { critical | high |
low }
Optional
By default, the PoE priority of
the port is low