Tait TB9100, Installation And Operation Manual

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98 Technical Description TB9100 Installation and Operation Manual
© Tait Electronics Limited May 2006
1. The RF signal is processed by the receiver circuitry on the RF board
and is passed to the ADC (analog-to-digital converter) in the digital
receiver.
2. The Modulator/Demodulator circuitry demodulates the RF signal.
3. The digital board DSP detects that the signal is digital P25 and passes
it on to the P25 modem.
4. The P25 modem extracts the digital bits from the received signal.
5. Error correction is carried out and the IMBE packets are passed
directly to the voter.
Figure 8.5 Path from receiver to voter (digital P25 mode)
Packet
Switch
ADC ADC
ADC
Voter
P25
Modem
Mod/
Demod
IMBE
Enc/Dec
G.711
Enc/Dec
FM Audio
Process
RTP
RF
Interface
Control Panel
Speaker/Microphone
Digital
Network
Analog Line
IMBE G.711
IMBE
IMBE/G.711 IMBE/G.711
Digital
Board DSP
Network
Board RISC
Network
Board DSP
IMBE
Dec*
Buffer Buffer