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54 Description TM9100 Service Manual

2.6 Operation in Transmit Mode

Overview This section describes the functioning of the transceiver in transmit mode.

The operation of the transceiver is illustrated in Figure 2.12 on page 48

(analog mode) and Figure 2.13 on page 49 (digital mode).

These block diagrams show the hardware modules integrated with the

software modules:

■ hardware (transmitter, receiver, CODEC and audio)

■ RISC processor (on FPGA of digital board)

■ custom logic (on FPGA of digital board)

■ DSP block (on digital board)

Note The block diagrams for the analog and digital modes only differ in

the operation of the DSP.

The transmit path consists of three major functional parts:

■ audio processing and signaling

■ frequency synthesizer

■ RF transmitter

Note The information flow on a digital radio can be categorized in two

forms, signaling (including user data) and voice. Whilst setting up

a call, signaling may be the only information transferred across the

air interface. Once a call has been established however, both sig-

naling and voice information are transported. The signaling infor-

mation continues throughout the call for the purpose of maintain-

ing the call and possibly sending data information.

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