EPS 2011-04

1-5

Introducing the HP 600 Redundant and External Power Supplies

RPS Port Operation

The 600 RPS/EPS can be connected to six switches through RPS cables, but

can provide redundant power to only one switch whose AC power or internal

power supply fails. The unit can provide up to 180 W of power at +12 VDC to

a single switch.

Each RPS port has a priority, with port 1 the highest and port 6 the lowest.

The 600 RPS/EPS always provides power to a switch connected to a higher

priority port, if necessary by dropping power to a switch on a lower priority

port. The switching of power from low-priority ports to high-priority ports is

completely automatic and effectively instantaneous.

The 600 RPS/EPS is able to detect switches connected to each RPS port and

also the status of their primary AC power supply. The unit supports a hot-plug

feature where switches can be connected or disconnected to the RPS ports

without causing any disruption either to switch operation or the 600 RPS/EPS.

Over-current protection on each RPS port prevents any switch from exceeding

the power supply limit of the unit. Any overload condition causes the 600 RPS/

EPS to shut down the port.

EPS Port Operation

The 600 RPS/EPS supports two EPS ports that can provide PoE power to HP

PoE switches through EPS cables. Each external power supply unit can

provide PoE power to a switch as a primary source or as a backup to a switch

that has its own internal PoE power supply.

The EPS ports operate as a pair. The 600 RPS/EPS has one pair of EPS ports

that can provide up to 408 W of PoE power at -50 VDC. There are four possible

power allocations for each EPS port pair:

■ Maximum power allocated to the first port and none to the second

■ Maximum power allocated to the second port and none to the first

■ Each port in the pair are allocated half of the maximum power

■ No power allocated to either port in the pair