Poe Power Requirements - HP ProCurve 2520 Planning And Implementation Manual

Operating Rules
Provisioning Power for PoE

PoE Power Requirements

It is important to understand the PoE power requirements of these switches
because if the PoE power is not planned and implemented correctly, end
devices connected to the PoE switch ports may not receive power if a switch
PoE power source failure occurs or if the switch is over provisioned.
The Switch 2600-8-PWR has 8 ports and its internal PoE power supply provides
126 watts across all 8 ports. If a 600 RPS/EPS or a 610 EPS device is connected
to the Switch 2600-8-PWR for the purpose of supplying external power to the
PoE portion of the switch, there will be either 408 watts or 204 watts of power
available should the switch's internal PoE power supply fail. If a single switch
is connected to the EPS ports on the 600 RPS/EPS or a single port of a pair on
the 610 EPS, 408 watts are available, providing fully redundant PoE power to
the switch.
If two switch devices are connected to the EPS ports on the 600 RPS/EPS or
to both ports of a pair on the 610 EPS, only 204 watts are provided to the switch
if the internal PoE power supply fails. This will still provide enough wattage
to be a full PoE backup for the Switch 2600-8-PWR because it only needs 126
watts.
The Switch 2626-PWR has 24 ports and its internal PoE power supply provides
406 watts across all 24 ports. If a 600 RPS/EPS or a 610 EPS device is connected
to the Switch 2626-PWR for the purpose of supplying external power to the
PoE portion of the switch, there will be either 408 watts or 204 watts of power
available should the switch's internal PoE power supply fail. If a single switch
is connected to the EPS ports on the 600 RPS/EPS or a single port of a pair on
the 610 EPS, 408 watts are available, providing fully redundant PoE power to
the switch. If two switch devices are connected to the EPS ports on the 600
RPS/EPS or to both ports of a pair on the 610 EPS, only 204 watts are provided
to the switch if the internal PoE power supply fails.
The Switch 2650-PWR PoE power requirements are different. This switch has
48 ports and the internal PoE power supply supplies 406 watts across all 48
ports. The switch reserves 38 watts for either ports 1-24 or 25-48, so that
neither set of ports receives the entire 406 watts.
By connecting a 600 RPS/EPS or a 610 EPS to the Switch 2650-PWR, more PoE
power is provided to the switch. With the 600 RPS/EPS or the 610 EPS
connected to the Switch 2650-PWR, the internal PoE power supply provides
the first 24 ports (1-24) with 406 watts and the 600 RPS/EPS or the 610 EPS
supplies the second 24 ports (25-48) with 408 or 204 watts (408 watts if only
one switch is connected to the EPS ports; 204 watts if two switches are
connected to the EPS ports). If the internal PoE power supply in the 2650-
PWR switch fails, 408 watts or 204 watts are provided to ports 1-48. 38 watts
of power are always allocated to ports 1-25 or 25-48.
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