Technical data

Field-replaceable units
You can replace the power supply and fan assemblies on-site without the use of special tools. The field-
replaceable units (FRUs) are keyed to ensure correct orientation during installation. Replacement
instructions are provided with all FRUs ordered.
DANGER
Remove both power cords before servicing.
DANGER
Disconnect the power cord from all power sources to completely remove power from the device.
Power supplies and fans
The two PSU FRUs are hot-swappable. They are identical and fit into either bay. They are keyed to
prevent being inserted upside down. Each PSU has an input rated voltage of 100-240 V and a typical
Input operating range of 90-264 V. Output is 12 V which can drive up to 1100 W load.
Fabric OS identifies the power supplies as follows (viewing the switch from the nonport side):
• Power supply #1 on the right
• Power supply #2 on the left
Fabric OS identifies the fan assemblies as follows (viewing the switch from the nonport side):
• Fan assembly #1 on the right
• Fan assembly #2 in the middle
• Fan assembly #3 on the left
Any of the following methods can be used to determine whether a FRU requires replacing:
• Check the AC Status and DC Status LEDs (refer to LEDs on the nonport side of the switch on page
34). If the AC Status LED is black, verify that you are using the correct cord and power source. If the
DC Status LED is black or flashing, then the FRU should be replaced. Refer to the table describing
nonport side LED patterns during normal operation in LEDs on the nonport side of the switch on
page 34 for information about power supply faulty states.
• In BNA, double-click the switch icon to open Web Tools, and then click the Power Status icon. Enter
the psShow command at the command prompt to display power supply status.
• In BNA, double-click the switch icon to open Web Tools, then click the Fan Status icon. Enter the
fanShow command at the command prompt.
Powering off the switch
Perform the following steps to power off the switch.
1. Enter the sysShutdown command.
This command not only shuts down the key processors but also powers off the switch and all LEDs
will go dark.
2. Unplug the AC power cords.
Field-replaceable units
Brocade 7840 Extension Switch Hardware Reference Manual 37
53-1003127-02