Avaya S8700 Maintenance Manual page 167

For multi-connect configurations

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Isolating and Repairing Packet-Bus Faults

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.

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.

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.

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.

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.

Issue 1 May 2002

Troubleshooting