3Com 7757 Configuration Manual page 722

722 C 64: P E C
HAPTER O ONFIGURATION
n
Setting the PoE Feature
of a PoE Port
Table 581 Configure the PoE feature of a PoE-enabled board
Operation
Enable the compatibility
detection feature for remote
PDs of the board
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.
Table 582 Set the PoE management mode and PoE priority of a port
Operation
Enter system view
Enter Ethernet port view
Enable the PoE feature
Set the maximum power
supplied by the port
Set the power supply mode of
the port
Se the PoE priority of the port poe priority { critical | high |
Command
poe legacy enable slot
slot-number
Command
system-view
interface interface-type
interface-number
poe enable
poe max-power max-power Optional
poe mode { signal | spare }
low }
Description
Optional
By default, compatibility
detection is disabled for PDs.
Description
-
-
Required
By default, the PoE feature is
enabled on a port when the
PoE feature is enabled on a
module.
By default, the maximum
power supplied by the port is
15.4 W.
Optional
The Switch 7750 support only
the signal mode.
Optional
By default, the PoE priority of
the port is low