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The ProCurve Switch 8200zl/5400zl/3500yl
series can power any device that adheres to
the IEEE 802.3af standard. In addition, devices
using pre-standard Cisco PoE power can also
be powered. The switches will automatically
detect what type of power and how much is
needed when a compatible device is plugged
into the port.
There are two different power supplies
available for the ProCurve 8200zl/5400zl. Both
power supplies provide system power (the
power needed to run the switch itself) and PoE
power (the power sent down the Ethernet
cable to power the device at the other end).
The only difference between the two supplies
is the amount of PoE power available from the
supply. This will be discussed in Step 4 of the
procedure below.
It is important to plan for peak PoE power
needs so that sufficient power is available in
the switch. When the peak power needs of the
powered devices (PDs) connected to the switch
exceed the PoE power available from the
supplies, the PoE power priority in the switch
is used to determine which ports lose PoE
power. Consult the switch manual for a
discussion of the PoE power priority
capability. Ports that lose their PoE power will
not be powered again to prevent them from
turning on and off, unless the loss of power
was due to a power supply failure. To avoid
this situation, use this guide to correctly size
the power supplies.
A PoE power configurator that automates
some of the power supply selection is
available at the ProCurve Networking
Web site (www.procurve.com). For best
results, use this guide in conjunction with
the Web configurator.
Choosing the number and type of supplies that
is best for your solution is a four-step process.
Step 1: Determine your PoE
power needs for the chassis.
Count the number of PDs and the PoE peak
power each consumes. The actual peak power
needed by a powered device should be
available in the documentation or data sheet
for that device. The 8200, 5400, and 3500
switches can allocate actual PD power
rounded up to the nearest watt. Add up the
total wattage needed. Also add 22 W for each
Gigabit PoE module in the chassis. The first PD
plugged into each module will release 17 W of
this module allotment back to the switch PoE
power pool. For this reason, it is recommended
to have at least one PD plugged into each PoE
module as PDs are added to the switch.
2
Part 1: zl series chassis power supply
selection (PoE)