Circuit Pack LEDs
Issue 1 May 2002
6-15
555-233-143
Maintenance/Test Circuit Pack LEDs
The TN771D maintenance/test circuit pack has the standard red, green, and
yellow LEDs. The red and green LEDs have the traditional meaning, where red
indicates an alarm condition, and green indicates testing in progress.
The yellow LED can be off or on continuously or flashing, depending on the mode
of operation of the TN771D and whether or not it has detected errors. The yellow
LED is on steady when the TN771D’s analog test port or digital test ports are
being used to test trunks or line circuits. The yellow LED is also used to indicate
packet-bus status.
illustrates the maintenance/test yellow LED states
as they apply to packet-bus activity.
A detailed description of the TN771D standalone mode is provided in the
‘‘Isolating and Repairing Packet-Bus Faults’’
section of
.
Table 6-5.
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.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...