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 pac k into the slot. The system will not recognize
the presence of the circ uit pack.
If the standalone mode is entered s uccessfully, the following is disp layed on the
connected terminal:
!CAUTION:

If the above display d oes not appear, c heck the wiring betwee n the

terminal and the TN771D, and the terminal p arameters settings. If these are

correct, the TN771D may be defe ctive. In such a case, use the following

procedures to exit stand alone mode and then test the Mainten ance/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 accep ted on the terminal. The circuit p ack must be repla ced.

To exit standalone mode:
1. Remove the 258A Adapter from the Amphenol c onnector.
2. If the TN771D was installed for this proced ure, 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 command s are available:
ds Displays the current state of the p acket bus leads .
dsa Toggles auto-report mode on and off. In auto-report mode , the
state of the packet bu s leads are displayed and the terminal
beeps whenever a chang e occurs.
? Displays the available c ommands.
TN771 STANDALONE MODE
(Type “?” at the prompt for help)
Command: