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Circuit pack LEDs
Issue 1 June 2005 267
Table 68: TN771D Maintenance/Test Yellow LED States
LED State
1
1. 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
2
2. 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
3
3. “Standalone” refers to the TN771D’s capability to operate autonomously as a troubleshooting aid.
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.