Status Leds Of A Cooling Unit Fan - Nortel Passport 15000 Hardware Description

362 Chapter 7 Using status indicator LEDs and sounds

Status LEDs of a cooling unit fan

241-1501-200 5.2S2
The status LEDs for each fan of both the front and rear cooling units is shown
at the front of the frame so that the status of the rear (lower) fans can be
determined without going to the rear of the frame. The rear cooling unit's
LEDs are duplicated at the front and back of the Passport 15000 or 20000.
The LEDs are labeled with G and R to distinguish between green and red.
For a cooling unit in a startup mode after installation and powering up, the
LEDs cycle in sequence from solid red to solid green.
After normal operation when a lit LED is not green, assess the impact of the
ambient room temperature on a Passport 15000 or 20000 being cooled by two
fans and do "What to do when a lit red LED is detected" (page 344).
When the LED beside a fan is off after the fan or its controller has been
replaced, verify the in-line 4 A fast-acting fuse between the controller and its
input power has not blown. If so, replace the controller because the fuse is
soldered in.
When a fan fail occurs, major software alarm 7012 0051 is generated and both
the major and minor hardware alarm lights are lit. For information on
hardware alarms, see "Hardware alarm definitions" (page 66).
Upon the first fan failure:
• the fan trouble indicator light goes from green to red
• the frame-level alarm indicator displays a minor and a major alarm
• a major software alarm is raised at the network management console
• single fan failures should be attended to immediately or, alternately,
within 48 hours
Upon the second and third fan failures:
• the fan trouble indicator light goes from green to red
• the frame-level alarm indicator continues to display a minor and a major
alarm unless something else has changed