Isolating and Repairing Packet-Bus Faults
Issue 1 May 2002
4-93
555-233-143
Entering and Exiting Stand-Alone Mode
While in stand-alone mode, the TN771D’s red LED is lit. This is normal and
serves as a reminder to remove the TN771D from stand-alone mode.
!
CAUTION:
A TN771D in stand-alone mode must be the only TN771D in the EPN. If one
is already in the EPN, place it in stand-alone mode. Do not insert a second
TN771D. Otherwise, the system cannot detect the extra circuit pack and will
behave unpredictably.
!
CAUTION:
If the TN771D packet bus port has reconfigured the packet bus in a
critical-reliability system (indicated by error type 2049 against PKT-BUS),
placing the Maintenance/Test in stand-alone mode causes a loss of service
to the packet bus. In this case, this procedure disrupts service.
For EPNs with a TN771D already installed:
1. Ensure that alarm origination is suppressed either at login or by using the
command change system-parameters maintenance.
2. Attach the 258A 6-port male Amphenol adapter to the Amphenol connector
behind the carrier corresponding to the TN771D’s slot. Connect one end of
a D8W 8-wire modular cable to port 1 of the 258A. Connect the other end
of the cable to a 355A EIA-232 adapter. Plug the EIA-232 adapter into the
terminal to be used, and turn the terminal on.
3. Reseat the TN771D circuit pack.
NOTE:
On a critical-reliability system, this causes a MINOR OFF-BOARD
alarm to be raised against PKT-BUS. This alarm is not resolved until
the TN771D’s packet bus port (M/T-PKT) is returned to service. To
ensure that PKT-BUS alarms have been cleared, it may be necessary
to restore the TN771D to normal mode.
For EPNs without a TN771D installed:
1. Attach the 258A 6-port male Amphenol adapter to the Amphenol connector
behind the carrier corresponding to the slot where the TN771D is to be
inserted. Connect one end of a D8W 8-wire modular cable to port 1 of the
258A. Connect the other end of the cable to a 355A EIA-232 adapter. Plug
the EIA-232 adapter into the terminal to be used, and turn the terminal on.
2. Insert the TN771D circuit pack into the slot. The system will not recognize
the presence of the circuit pack.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...