Tait TB9100, Installation And Operation Manual

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20 Description TB9100 Installation and Operation Manual
© Tait Electronics Limited May 2006
The PMU fan has fixed on/off thresholds and a defined set of duty cycles
based on the PMU temperature, as follows:
Run and Standby Modes
The TB9100 normally operates in Run mode, but you can use the CSS to
put it in Standby mode.
Run mode
In Run mode, the base station performs its normal functions.
Standby mode
When you program the base station or run invasive diagnostic tests, the base
station must be in Standby mode. This takes the base station out of service.
However, the control panel is still effective; you can use it to send and
receive over the air and across the analog line and to receive from the digital
line.
Dual Mode
The TB9100 base station can handle analog FM calls as well as digital P25
calls. It is a dual-mode base station. However, it can be configured to always
operate in one mode. For example, if only digital P25 radios use the base
station, the base station can ignore analog FM calls. Note that at any one
time, the base station can only handle one call, either analog FM or digital
P25. It cannot receive in one mode and simultaneously transmit in the other.
Analog FM mode
In Analog FM mode, the base station can receive and transmit over the RF
interface using analog FM modulation. Analog FM speech is sent and
received on the digital line using the G.711 format.
Digital P25 mode
In digital P25 mode, the base station can receive and transmit over the RF
interface using digital P25 modulation. Digital speech is in the IMBE
(Improved Multi-Band Excitation) format.
Dual mode
configuration
Dual mode is configured not for the base station as a whole, but for the
inputs at a particular interface. The mode of outputs is not configurable; it
can always be either analog FM or digital P25, depending on the input.
When the base station receives an input on an interface, it operates in the
mode of that input.
PMU Temperature Duty Cycle
<149°F (65°C) Increases with increasing current draw
149-167°F (65-75°C) On two minutes, off one minute
>167°F (75°C) Always on