EPS 2011-04

3-4

Introducing the HP 620 Redundant and External Power Supply

RPS Port Operation

RPS Ports on the HP 620 RPS/EPS

The HP 620 RPS/EPS has two redundant power supply ports and can provide

system power to two connected switches simultaneously.

EPS Ports on the HP 620 RPS/EPS

The HP 620 RPS/EPS has two EPS ports. You can connect one or two HP PoE

switches to provide PoE power as a primary or backup source. Both ports

provide the maximum power (398 W) simultaneously. Each EPS port is

independent of the other. Therefore if one fails the other can still provide EPS

power.

Port Status LEDs

The RPS and EPS port status LEDs on the HP 620 RPS/EPS back panel are a

duplication of those on the front panel. For a description of these LEDs, see

Table 3-1 on page 3-2.

Power Connector

The HP 620 RPS/EPS does not have a power switch; it is powered on when

connected to an active AC power source. The HP 620 RPS/EPS automatically

adjusts to any voltage between 100-127 and 200-240 volts and either 50 or 60

Hz. There are no voltage range settings required.

RPS Port Operation

The HP 620 RPS/EPS can be connected to two switches through RPS cables.

Each RPS port is independent of the other. Therefore if one fails the other can

still provide RPS power. The unit can provide up to 195 W of power at +12 VDC

to a each switch simultaneously.

The HP 620 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 HP 620

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 HP 620 RPS/EPS to shut down the port. See “RPS Connections on the HP

620 RPS/EPS” on page 5-36.