Avaya MCC1 Maintenance Procedures page 255

Figure 73: Normal standalone mode display
CAUTION:
If the display in
be sure to check the wiring between the terminal and the TN771, and also the terminal
parameters. If these are correct, the TN771 may be defective. In such a case, follow the
procedures to exit standalone mode (described in the next paragraph). Then test the
Maintenance/Test circuit pack.
NOTE:
If the TN771 fails while in standalone mode, the message
failed
must be replaced.
Use the following procedures to exit standalone mode:
1 Remove the 258A Adapter from the Amphenol connector.
2 If the TN771 was installed for this procedure, remove it. Otherwise, reseat the TN771.
3 Be sure that alarm origination is re-enabled on the Maintenance-Related System Parameters form
if it was disabled there (if it was disabled at login, it is automatically re-enabled at logoff).
Using standalone mode in packet bus maintenance
When the TN771 is in standalone mode, three commands can be used at the terminal:
• 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.
Figure 74, Example standalone mode display,
display. In the display, an 'S' indicates a shorted lead, an 'O' indicates an open lead, and a blank indicates
no fault.
Maintenance Procedures
December 2003
TN771 STANDALONE MODE
(Type "?" at the prompt for help)
Command:
Figure 73, Normal standalone mode display,
is displayed, and no further input is accepted on the terminal. The circuit pack
Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
TN771 circuit pack
on page 256 presents an example of a standalone mode
on page 255 does not appear,
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