HP 5300 Informacje Techniczne Pobierz pdf (Strona 195)

Power Over Ethernet (PoE) Operation

General PoE Operation

with 20 watts of PoE power remaining available on a module, you can connect

one new PD without losing power to any currently connected PDs on that

module. If that PD draws only 3 watts, then 17 watts remain available and you

can connect at least one more PD to that module without interrupting power

to any other PoE devices connected to the same module. If the next PD you

connect draws 5 watts, then only 12 watts remain unused. With only 12 unused

watts available, if you then connect yet another PD to a higher-priority PoE

port, then the lowest-priority port on the module loses PoE power and remains

unpowered until the module once again has 15.4 or more watts available. (For

information on power priority, refer to

“Power Priority Operation” on page 11-

8.)

Disconnecting a PD from a PoE port causes the module to stop providing PoE

power to that port and makes the power available to any other PoE ports on

the module that have PDs connected and waiting for power. If the PD demand

for power on a module becomes greater than the PoE power available on the

module, then the module transfers power from its lower-priority ports to its

higher-priority ports. (Ports not currently providing power to PDs are not

affected.)

Note 15.4 watts of available power is required for an xl PoE module on a switch to

begin delivering power to a port, such as when a newly connected PD is

detected or when power is released from higher-priority ports. Depending on

power demands, lower-priority ports on a module with high PoE power

demand may occasionaly lose power due to the demands of higher-priority

ports on the same module. (Refer to

“Power Priority Operation” on page 11-8.)

Table 11-1. xl PoE Module Maximum Power Allocations

Power-Sourcing

Equipment (PSE) Load on

the EPS

Power to PoE

Module from

External EPS

PoE Power Available for the xl PoE (J8161A)

Module

One xl PoE Module Only 408 Watts Maximum (15.4 W) available to all ports on the

module.

Two PSE Devices (Two xl

204 Watts Depending on the power demand from the PDs,

PoE Modules, or one xl PoE

lower priority ports may not be provisioned.

Module and One HP

Refer to “Calculating the Maximum Load for an

ProCurve PoE Stackable

xl PoE Module” on page 11-19.

Switch)

If an HP 600 RPS/EPS is supplying PoE power to two PSE devices, then both PSE devices

receive 204 watts. If an HP 600 RPS/EPS is delivering PoE power to only one PSE device, then

that device receives 408 watts.

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