Hp Procurve 3500-Poe Switches; Maximum Poe Power; Poe Power Requirements - HP ProCurve 2520 Planning And Implementation Manual

Operating Rules
Provisioning Power for PoE

HP ProCurve 3500-PoE Switches

Maximum PoE Power

The HP ProCurve 3500-24-PoE switch provisions (allocates power to) ports
1-24 with 398 watts of power for PoE applications compatible with the IEEE
802.3af standard and some pre-standard devices. The HP ProCurve 3500-48-
PoE switch provisions ports 1-48 with 398 watts. This only allows half the per-
port wattage as is available on the 3500-24-PoE switch.
An external power supply, the HP ProCurve 620 RPS/EPS (J8696A), can be
connected to either of the HP ProCurve 3500-PoE switches to provide
redundant or extra PoE power. The 620 RPS/EPS can be connected to up to
two switches and provide 388 watts of 50V power to each switch.
Table 2-6.
PoE Devices
PoE for Switch
3500-24-PoE
PoE for Switch
3500-48-PoE

PoE Power Requirements

The HP ProCurve 3500-24-PoE switch has 24 ports with an internal PoE power
supply that provides 398 watts of 50V power across all 24 ports. The HP
ProCurve 3500-48-PoE switch has 48 ports with 398 watts of 50V power across
all 48 ports. There is a special power provision on the 3500-48-PoE switch
where the switch reserves 22 watts for each bank of 24 ports, ports 1-24 and
25-48, so that neither set of ports receives the entire 398 watts. This is designed
for the integrity and safety of PoE during power balancing to properly detect
PDs and bring them online.
2-16
Maximum Power Allocations for the 3500-PoE Switches
Internal Only
398 watts available to 398 watts available to ports 1-24
ports 1-24. (provided by the internal source).
388 watts available as backup in
case of failure, provided by the
398 watts available to 786 watts available to ports 1-48
ports 1-48. (provided by both the internal and
Internal and External
external source.
external sources).
External Only
The internal power supply
has failed, and the external
source provides 388 watts to
ports 1-24.
The internal power supply
has failed, and the external
source provides 388 watts to
ports 1-48. Note that a
minimum of 22 watts will
always be allocated to both
port groups (ports 1-24 and
ports 25-48).