Dell Networking 7048, Reference Manual

Page: 1505 / 1788

Power Over Ethernet Commands
1505
72
Power Over Ethernet Commands
The PowerConnect PoE solution implements the PoE+ specification (IEEE
802.3at). IEEE 802.3at allows power to be supplied to Class 4 PD devices that
require power greater than 15.4 Watts and up to 32 Watts. This allows the
PoE+ enabled network switches and routers to be used for deployment with
devices that require more power than the 802.3AF specification allows. PoE+
802.3at is compatible with 802.1AF.
Flexible Power Management
The PowerConnect PoE solution provides power management which
supports power reservation, power prioritization and power limiting. The
operator can assign a priority to each PoE port. When the power budget of
the PoE switch has been exhausted, the higher priority ports are given
preference over the lower priority ports. Lower priority ports are forcibly
stopped to supply power in order to provide power to higher priority ports.
The Static Power Management feature allows operator to reserve a
guaranteed amount of power for a PoE port. This is useful for powering up
devices which draw variable amount of power and provide them an assured
power range to operate with in.
In the Dynamic Power Management feature, power is not reserved for a given
port at any point of time. The power available with the PoE switch is
calculated by subtracting the instantaneous power drawn by all the ports from
the maximum available power. Thus more ports can be powered at the same
time. This feature is useful to efficiently power up more number of devices
when the available power with the PoE switch is limited.
The PowerConnect PoE solution also provides global usage threshold feature
in order to limit the PoE switch from reaching an overload condition. The
operator can specify the limit as a percentage of the maximum power.
Commands in this Chapter
This chapter explains the following commands:
2CSPC4.X7000-SWUM204.book Page 1505 Friday, March 15, 2013 8:22 AM