DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-91Packet Bus Fault Isolation and Repair
5
2. Insert the TN771D circuit pack into the slot. The system will not recognize
the presence of the circuit pack.
If the standalone mode is entered successfully, the following is displayed on the
connected terminal:
!
CAUTION:
If the above display does not appear, check the wiring between the
terminal and the TN771D, and the terminal parameters settings. If these are
correct, the TN771D may be defective. In such a case, use the following
procedures to exit standalone mode and then test the Maintenance/Test
circuit pack. Refer to M/T-BD and M/T-PKT in
Chapter 9, ‘‘Maintenance
Object Repair Procedures’’
. If the TN771D fails while in standalone mode,
the message
TN771 circuit pack failed
is displayed, and no further
input is accepted on the terminal. The circuit pack must be replaced.
To exit standalone mode:
1. Remove the 258A Adapter from the Amphenol connector.
2. If the TN771D was installed for this procedure, remove it. Otherwise,
reseat the TN771D.
3. If
change system-parameters maintenance
was used to disable alarm
origination, re-enable it now.
Using Standalone Mode in Packet Bus Fault
Isolation and Correction
When the TN771D is in standalone mode, three commands are available:
ds Displays the current state of the packet bus leads.
dsa Toggles auto-report mode on and off. In auto-report mode, the
state of the packet bus leads are displayed and the terminal
beeps whenever a change occurs.
? Displays the available commands.
TN771 STANDALONE MODE
(Type “?” at the prompt for help)
Command:
