TB9100/P25 CG/P25 TAG Installation and Operation Manual Installation 51
© Tait Limited March 2014
Notice The subrack interconnect board has a set of switches which
must be set according to the type of base station in the subrack. Refer to
“Switch Settings” on page 112 for details of the switch settings.
The dual base station has a number of operational constraints. Many of these
are because the second base station does not communicate with the PMU.
This can cause base station 2 to raise false alarms when it does not detect a
PMU or PMU fan rotation.
The constraints and recommended CSS settings are listed below.
Subrack ■ The front panel LEDs and switches are controlled by the currently
selected base station.
■ The second base station does not communicate with the PMU, but the
PMU does provide power to it.
CSS ■ As there is no PMU on base station 2, no PMU settings for this base
station will function. This includes the PMU battery voltage display,
monitoring, diagnostics, and power management display. Also, the
output power set in the Battery Power (W) column in the channel
table will not take effect (refer to “Operation on Battery Back-up
Power” on page 52).
■ All PMU alarm LEDs on the Alarm screen of base station 2 will be grey.
■ If you read a configuration from base station 2 and then go to Configure
> Alarms > Element Thresholds, the PMU battery voltages will be at
zero. If you want to click OK to confirm any changes to the screen, you
need to re-enter the PMU voltages. If not, just click Cancel.
■ In the Configure > Network Element > Miscellaneous form for base
station 2, the Power configuration areas will display voltages of zero.
If you want to click OK to confirm any changes to the screen, you need
to re-enter these voltages. If not, just click Cancel.
■ All fan faults will not be displayed or acted on if the failure occurs on the
base station that is not currently selected.
■ The display of fan states in Diagnostic forms may be incorrect.
Recommended CSS
Settings
The following CSS settings are recommended for dual base station
operation:
■ Disable the “No PMU detected” alarm on base station 2 (Configure >
Alarms > Control). Also on this screen disable the “Fan failed” alarm for
the PMU on base station 2.
■ On base station 2 disable any Task Manager statements that use the “No
PMU detected” or “Fan failed” alarm inputs (Configure > Task
Manager > Task List).
■ We also recommend that you disable any Task Manager statements on
base station 1 that use the “Fan failed” alarm input. This will prevent
false fan alarms if a dual base station is operated with base station 2
selected on the control panel.
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