TB8100 Installation and Operation Manual Functional Description 57
© Tait Electronics Limited June 2005
Fans used in the TB8100 must have the correct wiring: power and ground
(2-wire fans), or power, ground and rotation detect (3-wire fans). Both fans
in the subrack must be of the same type.
If 3-wire fans are fitted, the reciter can monitor whether the fans are rotating
and generate an alarm if the fan fails. Refer to the Service Kit and Alarm
Center documentation for more details. Refer also to “Dual Base Station
System” on page 38 for information on the constraints of fan rotation
detection in dual base station systems.
4.8 Power Saving
TB8100 base stations can be equipped with Power Saving. This set of
sophisticated current-reducing measures is made available through the
optional Power Saving Modes licence. Under the control of the reciter, all
modules in the subrack work together to offer many levels of current
reduction. The receiver circuitry can cycle on and off, parts of the PA
circuitry can be switched off, and the PMU can enter a power-saving
Hysteresis mode or even shut down its main DC-DC converter. These
measures can achieve a dramatic reduction in power consumption during
idle periods.
Power Saving is available for 5W, 50W and 100W base stations. There can
only be one base station in the subrack and most Power Saving measures are
only available when the base station is running on battery power. Dual base
stations cannot have Power Saving, but they can be configured to provide
modest reductions in current consumption. The same configuration can be
used for single base stations without a Power Saving licence. This brings
their power consumption in line with the Tait T800 range.
Two optional hardware items are needed to maximise the amount of power
that the base station can save. The TBA2010 Power Save Control Panel (for
further information, see “Power Save Control Panel” on page 32) is
designed for base stations with Power Saving; most of its circuitry can be
switched off. The PMU standby power supply card enables it to run in
Hysteresis mode or to turn off its DC-DC converter.
Power Saving is implemented in three different modes: Normal, Sleep, and
Deep Sleep. This makes it possible for the extent of the power saving
measures to vary depending on the amount of traffic on the channel. Each
mode combines a number of power saving measures and is enabled and
configured through the Service Kit.
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