director 2/64 service manual

director 2/64 service manual 1–21
General Information
• A power switch (circuit breaker) that controls AC power distribution to both
power supplies. The breaker is set manually, or is automatically tripped by internal
software if thermal sensors indicate the director is overheated.
• A 9-pin maintenance port that provides a connection for a local terminal or dial-in
connection for a remote terminal. Although the port is typically used by
maintenance personnel, operations personnel use the port to configure network
addresses.
• An input filter and AC system harness (internal to the FRU) that provides the
wiring to connect the AC power connectors to the power switch and power
supplies (through the backplane).
Fan Module
Two fan modules, each containing three fans (six fans total), provide cooling for
director FRUs, as well as redundancy for continued operation if a fan fails.
The fan module can be replaced while the director is powered on and operating,
provided the module is replaced within ten minutes (after which software powers off
the director). An amber LED for each fan module illuminates if one or more fans fail
or rotate at insufficient angular velocity.
SBAR Assembly
The director is delivered with two SBAR assemblies. The active SBAR is responsible
for Fibre Channel frame transmission from any 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 transmission without interruption.
Failover to the backup assembly is transparent to attached devices.
Each SBAR assembly consists of a card and steel carriage that mounts flush on the
backplane. The carriage provides protection for the back of the card, distributes
cooling airflow, and assists in aligning the assembly during installation. The rear of
the carriage contains a green LED that illuminates if the assembly is operational and
active, and an amber LED that illuminates if the assembly fails. Both LEDs are
extinguished on an operational backup assembly. The amber LED blinks if FRU
beaconing is enabled.