DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-90Packet Bus Fault Isolation and Repair
5
■A slot in the A carrier is preferab le for EPNs if the above conditions are
met.
Entering and Exiting Standalone Mode
When in standalone mode, the red LED on the TN771D is lit This is normal and
serves as a reminder to remove the TN771 from standalone mod e.
!CAUTION:

The TN771D in standalone must be the only TN771D in the port network. If

a TN771D is already in the port network, pla ce that TN771D in standalone

mode. Do not insert a second TN771D. Otherwise, the system is not able to

detect the extra circ uit pack and will b ehave unpredicta bly.

!CAUTION:

If the TN771D packet bus port has rec onfigured the pac ket bus in a Critical

Reliability system (indicated by error type 2049 agains t PKT-BUS), placing

the Maintenance/Test in standalone mode causes a loss o f service to the

packet bus. In this c ase, this proced ure disrupts service.

For port networks with a TN771D already installed:
1. Ensure that Alarm Origination is suppressed either at login or via change
system-parameters maintenance.
2. Attach the 258A 6-Port Male Amphenol Ad apter to the Amphenol
connector on the bac k of the carrier correspond ing to the TN771D’s slot.
Connect one end of a D8W 8-wire modular c able to port 1 of the 258A.
Connect the other end of the c able 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 c auses a MINOR OFF-BOARD
alarm to be raised ag ainst PKT-BUS. This alarm is not resolved until
the TN771D’s packet bus p ort (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 port networks without a TN771D installed:
1. Attach the 258A 6-Port Male Amphenol Ad apter to the Amphenol
connector on the bac k of the carrier correspond ing to the slot into which
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 c able to a 355A
EIA-232 Adapter. Plug the EIA-232 Adapter into the terminal to be used,
and turn the terminal on.