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24 Description TB9100/P25 CG/P25 TAG Installation and Operation Manual

other channel group members

■ DSP switch, for further routing and for converting back to analog

4. The DSP switch coordinates the DSP processing of the signals and

routes them to the RF interface, analog line and/or the control panel

speaker).

5. Each destination interface makes available the signal with the highest

priority for that interface.

Run and Standby Modes

The base station 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 channel

group interface.

Dual Mode

The 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 a call in one mode and repeat it 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 over the channel group interface 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.

Tait TB9100 User Manual

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