DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-88Packet Bus Fault Isolation and Repair
5
The Analog Trunk Testing functions are discussed in the ‘‘TIE-TRK (Analog Tie
Trunk)’’, ‘‘DID-TRK (Direct Inward Dial Trunk)’’, ‘‘CO-TRK (Analog CO Trunk)’’,
and ‘‘AUX-TRK (Auxiliary Trunk)’’, sections in Chapter 9, ‘‘Maintenance Object
Repair Procedures’’.
NOTE:
All Maintenance/Test circuit packs must b e of TN771D vintage or later.
TN771D Packet Functions
The Maintenance/Test packet bus port (M/T-PKT) provides the pac ket bus testing
and reconfiguration c apabilities. When the port is in servic e, it continuously
monitors the packet bus for fa ults and fault recoveries, and repo rts results to
PKT-BUS maintenance.
The yellow LED on the TN771D Maintenance/Test circuit pack provides a visual
indication of the state of the p acket bus:
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 op eration, the Maintenance/Test provides visual feedbac k
of the packet bus state. When in stand alone mode (see the next section), these
visual indications are still p resent, but the packet b us is never reconfigured. The
yellow LED either blinks or is off.
Flashing Flashing of the yellow LED once per second indicates that there
are too many faults for the Maintenance/Test packet b us port to
recover by swapp ing leads.

The packet bus may be unu sable

.
If the failures detected ar e open lead failures, the pac ket bus
may still be operating .
On steady The Maintenance/Test packet bus p ort has swapped lead s on
the packet bus to c orrect a fault.

The packet bus is still

operating

. Or, one of the other ports on the Maintenanc e/Test
circuit pack is in use.
NOTE:
First busy out the Maintenance/Test circuit pack p orts
used for other than packet b us testing before using the
Maintenance/Test circuit pack to help resolve packet bus
faults. This is done by entering busyout port UUCSS01,
busyout portUUCSSl02, and busyout port UUCSS03. Be
sure to release these ports when the process is
completed.
Off There is no packet bus fault present.