HP 2910AL - Manual (Page 255)

Power Over Ethernet (PoE+) Operation
PoE Operation
PoE Operation
N o t e You can connect either a PoE device (PD) or a non-PoE device to a port
configured for PoE operation.
Using the commands described in this chapter, you can:
■ Configure a non-default power threshold for SNMP and Event Log
reporting of PoE consumption on all PoE ports on the switch.
■ Specify the port priority you want to use for provisioning PoE power
in the event that the PoE resources become oversubscribed.
■ Enable or disable PoE operation on individual ports.
■ Monitor PoE status and performance.
A PSE detects the power needed by a PD before supplying that power, a
detection phase referred to as “searching”. If the PSE can’t supply the required
amount of power, it does not supply any power. A PSE will not supply any
power to a PD unless the PSE has at least 15.4W available. For example, if a
PSE has a maximum available power of 382W and is already supplying 378W,
and is then connected to a PD requiring 10W, the PSE will not supply power
to the PD.
N o t e The PSE output maximum is limited to a higher value than 15.4W. This may
affect how much power must be in reserve before a detected PD is supplied
with power. For example, if the maximum is 20W, then 20W must be currently
available for a detected PD to be supplied with power. This can reduce the
number of PDs that can be powered by the switch.
Configuration Options
In the default configuration, all Gig-T ports in a ProCurve switch covered in
this guide are configured to support PoE operation. You can:
■ Disable or re-enable per-port PoE operation on individual ports to
help control power usage and avoid oversubscribing PoE resources.
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