Installing the EPS4000
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DANGER
The procedures in this manual are for qualified service personnel.
DANGER
Before beginning the installation, see the precautions in “Power precautions.”
DANGER
Be careful not to accidently insert your fingers into the fan tray while removing it from the
chassis. The fan may still be spinning at a high speed.
EPS4000 external power supply
In the event of an AC power loss or internal power supply device failure, the Brocade EPS4000 external
power supply can be used as a 12-V, backup power source to a device when any of the DC power
supply ports are connected to an ICX 7250 device. The EPS4000 requires a minimum of one RPS17
Power Supply Unit (PSU) to be functional. Proprietary DC cables are used to connect any of the EPS
DC ports of the EPS4000 to the rear EPS4000 port of an ICX 7250 device that is supported by the
EPS4000. Each RPS17 PSU can provide backup power to one ICX 7250 device. Even though a fully
populated EPS4000 can monitor up to sixteen connected devices, the EPS4000 can provide backup
power without performance degradation to only four ICX 7250 devices.
NOTE
The primary source of 12-V power for an ICX 7250 device is the internal power supply. The EPS4000 is
designed to serve primarily as a backup source of 12-V power. You should service a failed ICX 7250
device as soon as possible after a 12-V power failure is detected.
In case of a 54-V supply failure, the EPS4000 can provide power to multiple devices up to its capacity
limit. You can set the system priority for the power budget allocation for this scenario. The default is for
Brocade ICX 7250 Switch Hardware Installation Guide
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