TB8100 Installation and Operation Manual Functional Description 51
© Tait Electronics Limited June 2005
Reciter Power
Control Signals
The power control signals PWD_EX, PWD_RX and PWR_ON (refer to
Figure 4.9 on page 67) are control lines internal to the reciter that originate
from the DSP on the digital board and are distributed to the RF and system
interface boards. These lines allow the power control software to selectively
turn on or off different reciter circuit blocks depending on the depth of
power savings configured.
PWD_EX controls the circuitry associated with the exciter RF path, such
as the exciter buffer amplifier, VCO and synthesizer.
PWD_RX controls the circuitry associated with the receiver RF path, such
as the receiver VCO and synthesizer.
PWR_ON turns off all non-critical control logic that is not required to
maintain a minimum level of RISC and DSP activity. This ensures a timed
power-up and activity cycling process. The RF and system interface board
are shut down completely.
4.5 PMU Operation on DC Input
The operation of the PMU on DC input is controlled by three sets of
parameters:
■ user-programmable alarms
■ user-programmable startup and shutdown limits
■ battery protection limits.
The voltage range for each of these parameters is provided in Table 4.1 on
page 53. Figure 4.6 on page 52 illustrates how these parameters interact,
and how they control the operation of the PMU over a range of DC input
voltages.
Alarms User-programmable alarms can be set for low or high battery voltage. The
alarms will be triggered when the set voltage levels are reached.
To set the alarms, run the Service Kit and select Configure > Alarms >
Thresholds. In the Thresholds form, enter the required minimum and
maximum values in the PMU battery voltage fields.
Startup and
Shutdown Limits
The user-programmable startup and shutdown limits allow for adjustable
startup and shutdown voltages. These limits can be adjusted for different
numbers of battery cells, or for the particular requirements of the base
station operation. Once the limits are reached, the PMU will shutdown.
To set the startup and shutdown limits, run the Service Kit and select
Configure > Base Station > Miscellaneous. In the Power Configuration
area, enter the required values in the Power shutdown voltage and
Power startup voltage fields.
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