Management and Configuration Guide K/KA/KB.15.15

Reconfigures the PoE priority level on <port-list>. For a given level, ports
Specifies the highest-priority PoE support for <port-list>. The active PoE
ports at this level are provisioned before the PoE ports at any other level are
provisioned.
Critical
Specifies the second priority PoE support for <port-list>. The active PoE
ports at this level are provisioned before the Low priority PoE ports are
provisioned.
High
(Default) Specifies the third priority PoE support for <port-list>. The active
PoE ports at this level are provisioned only if there is power available after
provisioning any active PoE ports at the higher priority levels.
Low
Controlling PoE allocation
Syntax
[no]int<port-list> 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.
The default option for PoE allocation is usage, which is what a PD attached to the
port is allocated. You can override this value by specifying the amount of power
allocated to a port by using the class or value options.
usage (Default) 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. Classes and their ranges are shown in Table 5
(page 111).
value A user-defined level of PoE power allocated for that port.
NOTE: The allowable PD requirements are lower than those specified for PSEs to
allow for power losses along the Cat-5 cable.
Table 5 Power classes and their values
ValuePower class
Depends on cable type and PoE architecture. Maximum power level output of 15.4 watts at the PSE.0
This is the default class; if there is not enough information about the load for a specific classification,
the PSE classifies the load as class 0 (zero.)
Requires at least 4 watts at the PSE.1
Requires at least 7 watts at the PSE.2
15.4 watts3
For PoE+4
Maximum power level output of 30 watts at the PSE.
Controlling PoE allocation 111