HP 2910AL - Manual (Page 260)

Power Over Ethernet (PoE+) Operation
Configuring PoE Operation
Enabling Support for Pre-Standard Devices
The ProCurve switches covered in this guide are automatically backward
compatible with 802.3af devices, and can also support some pre-802.3af
devices. For a list of the devices supported, refer to the FAQs for your switch
model.
Syntax: [no] power-over-ethernet pre-std-detect
Detects and powers pre-802.3af standard devices.
Note: This is enabled by default.
Controlling PoE Allocation
The default option for PoE allocation is usage, which is what a PD attached
to the port is allocated. You can specify the amount of power allocated to a
port by using the
class or value options.
.
Syntax: [no] int PoE-allocate-by [usage | class | value]
Allows you to manually allocate the amount of PoE power for
a port by either its class or a defined value.
usage: The automatic allocation by a PD.
class: Uses the power ramp-up signature of the PD to identify
which power class the device will be in. The power supplied to
the PD at the output of the PSE is separated into 4 classes.
Classes and their ranges are show in table 11-3. These are
approximately the minimum power amounts to be supplied by
the PSE. Actual PD needs may be within some range for each
class.
value: A user-defined level of PoE power allocated for that port.
N o t e The allowable PD requirements are lower than those specified for PSEs to
allow for power losses along the Cat-5 cable.
11-10