Avaya MCC1 Maintenance Procedures page 227

The analog trunk testing functions are discussed in the following sections in:
• TIE-TRK (Analog Tie Trunk)
• DID-TRK (Direct Inward Dial Trunk)
• AUX-TRK (Auxiliary Trunk)
NOTE:
Every Maintenance/Test circuit pack must be of TN771D vintage or later.
TN771D packet bus testing functions
The Maintenance/Test packet-bus port (M/T-PKT) provides the packet-bus testing and reconfiguration
capabilities. When the port is in service, it continuously monitors the packet bus for faults and fault
recoveries, and reports results to PKT-BUS maintenance.
The amber LED on the TN771D Maintenance/Test circuit pack provides a visual indication of the state of
the packet bus:
Flashing
Steady
Off
NOTE:
It takes 5 to 10 seconds for the LED to respond to a change in the state of the packet bus.
During normal switch operation, the Maintenance/Test circuit pack provides visual feedback of the
packet-bus state. When the circuit pack is in stand-alone mode (see
228), these visual indications are still present, but the packet bus is never reconfigured. The amber LED
either blinks, or is off.
Maintenance Procedures
December 2003
Flashing of the amber LED once per second indicates that there are too
many faults for the Maintenance/Test packet-bus port to recover by
swapping leads. The packet bus may be unusable. If the failures
detected are open lead failures, the packet bus may still be operating.
The Maintenance/Test packet-bus port has swapped leads on the packet
bus to correct a fault. The packet bus is still operating. Or, one of the
other ports on the Maintenance/Test circuit pack is in use.
NOTE:
First busy out the Maintenance/Test circuit pack's ports
not used for packet-bus testing before using this circuit
pack to help resolve packet-bus faults. This is done by
entering busyout port UUCSS01, busyout port
UUCSS02, and busyout port UUCSS03. Be sure to
release these ports when the process is completed.
There is no packet-bus fault present.
Packet and serial bus maintenance
Isolating and repairing packet-bus faults
TN771D in stand-alone mode on page
227