Service manual

1
Field-Replaceable Units
1-11
General Information
Each power supply has a separate backplane connection to allow for
different AC power sources. The power supplies are input rated at
180 to 264 volts alternating current (VAC). The faceplate of each
power supply provides the following status LEDs:
• A green AC OK LED illuminates if the power supply is
operational and receiving AC power.
• A green DC OK LED illuminates if the power supply is
operational and producing DC power.
•AredFAULT LED illuminates if the power supply fails.
AC Module
The AC module is located at the bottom rear of the director. Either
AC module can be replaced while the director is powered on and
operational. The module provides:
• Two single-phase, 220 VAC, power connectors.
• An input filter and AC system harness (internal to the FRU) that
provides the wiring to connect the AC power connectors to the
power supplies (through the backplane).
Fan Module
Threefan modules,each containing onesystemfan (threesystem fans
total), provide cooling for director FRUs, as well as redundancy for
continued operation if a fan fails.
A fan module can be replaced while the director is powered on and
operating, provided the module is replaced within ten minutes (after
whichsoftwarepowersoffthedirector).AnamberLEDforeachfan
module illuminates if one or more fans fail or rotate at insufficient
angular velocity.
SBAR Assembly
ThedirectorisdeliveredwithtwoSBARassemblies.TheactiveSBAR
isresponsibleforFibreChannelframetransmissionfromany director
port to any other director port. Connections are established without
software intervention. The assembly accepts a connection request
from a port, determines if a connection can be established, and
establishes the connection if the destination port is available. The
assembly also stores busy, source connection, and error status for
each director port.
The backup SBAR takes over operation if the active assembly fails,
and provides the ability to maintain connectivity and data frame