Overview
33
Director 2/64 Installation Guide
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. The transition 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 turns O
N
if the
assembly is operational and active, and an amber LED that turns O
N
if the
assembly fails. The amber LED F
LASHES
if FRU beaconing is enabled.
Power Module Assembly
The power module assembly is located at the bottom rear of the director. The
module provides the following.
■
Two single-phase AC power connectors. Each connector is input rated at 85
to 264 VAC.
■
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 has overheated.
■
A 9-pin maintenance port that provides a connection for a local terminal or
dial-in connection for a remote terminal.
