EPS 2011-04

5-27

Installing and Connecting the HP Redundant / External Power Supplies

Recommended Connection Topologies

Limitations

The HP 600 RPS/EPS can supply power to only one connected switch that

experiences a power supply failure at a time. In the illustration above, the

switch connected to RPS port 1 has the highest priority and the switch

connected to RPS port 6 has the lowest priority. When multiple switches fail,

a switch connected to a higher priority port always receives power before a

switch connected to a lower priority port.

Status Indication

The Power Status LEDs on the HP 600 RPS/EPS indicate if a port can provide

power. For example, if six switches are connected to the HP 600 RPS/EPS and

the power to the switch on port 4 fails, the Power Status LED for port 4 turns

on and for ports 5 and 6 it blinks. The Power Status LEDs for ports 1, 2, and 3

remain off. The blinking Power Status LEDs for ports 5 and 6 indicate that

they are lower priority ports and cannot supply power to the connected

switches. The Power Status LED’s are off for ports 1, 2, and 3 because they

have higher priority and if either port requests power, the power will be

removed from port 4 and given to either 1, 2, or 3.

EPS Connections on the HP 600 RPS/EPS

Recommendations

The HP 600 RPS/EPS is designed to provide primary or backup power to up

to two HP PoE switches. In the illustration below, two HP 2650 Switches are

being supplied with external PoE power from an HP 600 RPS/EPS. The

switches provide PoE power to Ethernet devices connected to their ports.