DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
LED Interpretation
7-14LEDs on Standby Components
7
Packet Bus status. Table 7-5 illustrates the Maintenance/Test yellow LED states
as they apply to Packet Bus activity.
LEDs on Standby Components
In high reliability and critical reliability option systems, duplicated components
that are on standby will usually have their yellow LEDs unlit, with the following
exceptions.
■ The Major, Minor and Warning alarm LEDs on the SYSAM circuit pack on
the standby SPE do not give reliable indications. Pay attention only to
those LEDs that are on the active SYSAM circuit pack.
■ The yellow LED will blink on and off when the standby Processor circuit
pack is up and standby maintenance is running.
Table 7-5. TN771D Maintenance/Test Yellow LED States
LED State
*
*. It takes 5 to 10 seconds for the yellow LED to respond to a change in the state of the
Packet Bus.
TN771D Mode Condition
Solid off Normal The Maintenance/Test circuit pack
detects no Packet Bus faults.
Solid on
†
†. Because the yellow LED on the Maintenance/Test circuit pack can also be on steady
when the digital and analog test ports on the circuit pack are in use, exact
interpretation of the yellow LED may require that the technician busy out the analog
and digital test ports or examine the error and Alarm Logs for PKT-BUS errors and
alarms.
Normal The Maintenance/Test Packet Bus
port has successfully reconfigured
the Packet Bus around a fault.
Flashing (1 Hz) Normal The Maintenance/Test Packet Bus
port is unable to reconfigure the
Packet Bus around a fault.
Solid off Standalone
‡
‡. “Standalone” refers to the TN771D’s capability to operate autonomously as a
troubleshooting aid. A detailed description of the TN771D standalone mode is
provided in the
‘‘Packet Bus Fault Isolation and Repair’’ section of Chapter 5,
‘‘Alarms, Errors, and Troubleshooting’’.
The Maintenance/Test detects no
Packet Bus faults.
Solid on Standalone This condition cannot normally
occur. The LED is always either off or
blinking in standalone mode.
Flashing (1 Hz) Standalone The Maintenance/Test Packet Bus
port detects a Packet Bus fault.
