HP procurve J8164A - Manual (Page 14)

Operatin
g Rule
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Operating Rules
External Switch Power
The Switch 2626-PWR has 24 ports and its internal PoE power supply provides
406 watts across all 24 ports. If an HP 600 RPS/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 368 watts or 184 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 HP 600 RPS/EPS, 368 watts are available,
providing fully redundant PoE power to the switch. If two switch devices are
connected to the EPS ports on the HP 600 RPS/EPS only 184 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 ports 25-48, so that
neither set of ports receives the entire 406 watts.
By connecting an HP 600 RPS/EPS to the Switch 2650-PWR, more PoE power
is provided to the switch. With the HP 600 RPS/EPS connected to the Switch
2650-PWR, the internal PoE power supply provides the first 24 ports (1-24)
with 406 watts and the HP 600 RPS/EPS supplies the second 24 ports (25-48)
with 368 or 184 watts (368 watts if only one switch is connected to the EPS
ports on the HP 600 RPS/EPS; 184 watts if two switches are connected to the
EPS ports).
If the internal PoE power supply in the 2650-PWR switch fails, 368 watts or
184 watts are provided to ports 1-48. 38 watts of power are always allocated
exclusively to ports 1 and 2 or 25 and 26. See
page 3-5 .
Switch Port Priority
The lower the port number the higher the priority given. For example, port
number one has a higher priority than port number two. Therefore when both
ports need power, port number one is given power priority over port number
two and so on throughout the rest of the ports.
A port can be assigned a power priority that alters the assignment of power
to it by the switch. See the software manual that came with your switch for
details.
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