Avaya MCC1 Maintenance Procedures page 254

Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
3 It is preferable that the slot chosen is in the A carrier if a free slot that matches the criteria
presented in the first two items of information in this list is available.
Entering and exiting standalone mode
NOTE:
When in standalone mode, the red LED on the TN771 is lit. This function is correct, and it
serves as a reminder to remove the TN771 from standalone mode.
CAUTION:
The TN771 in standalone must be the ONLY TN771 in the port network. If a TN771 is
already in the port network, place that TN771 in standalone mode. Do not insert a second
TN771 into standalone mode. System behavior is rendered as undefined if this is done. In
addition, the system is not able to detect the extra circuit pack in this case because a
TN771 in standalone mode is invisible to the SPE.
CAUTION:
If the TN771 Packet Bus port has reconfigured the Packet Bus in a switch with a High or
Critical Reliability system, (indicated by error type 2049 against PKT-BUS), placing the
Maintenance/Test in standalone mode causes a loss of service to the Packet Bus. This is
true because reconfiguration is not performed in standalone mode. Therefore, this
procedure should be considered a service-disrupting procedure.
If the system has a TN771 installed in the Port Network to be examined, use the following steps to enter
the standalone mode:
1 Ensure that Alarm Origination is suppressed either at login time or via the Maintenance-Related
System Parameters form.
2 Attach the 258B Six-Port Male Amphenol Adapter to the Amphenol connector for the TN771's
slot. Connect one end of a D8W 8-wire modular cable to port 1 of the 258B. 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 TN771 circuit pack.
NOTE:
In a High or Critical Reliability system, this causes a Minor, Off-board alarm to be raised
against the Packet Bus. This alarm is not resolved until the TN771 (in particular, the
Packet Bus port is returned to service. To ensure that Packet Bus alarms have been cleared,
it may be necessary to restore the TN771 to normal mode.
If there is no TN771 in the Port Network, use the following steps to enter the standalone mode:
1 Attach the 258A Six-Port Male Amphenol Adapter to the Amphenol connector for the slot into
which the TN771 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 TN771 circuit pack into the slot. The system does not recognize the presence of the
circuit pack.
If the standalone mode is entered successfully, the following is displayed on the connected
terminal
254
(Figure 73, Normal standalone mode display, on page 255):
Maintenance Procedures
December 2003