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TB9100 Installation and Operation Manual
Technical Description
99
© Tait Electronics Limited May 2006
From the RF
Interface (Analog
FM)
shows the signal path from the RF interface to the voter(s) for an
analog FM call.
An FM RF signal is processed as follows:
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 via an anti-alias filter.
2.
The Modulator/Demodulator circuitry demodulates the RF signal.
3.
The digital board DSP does not detect any digital P25 RF signals and
so passes voice stream on to the audio circuitry for analog FM calls.
4.
The Audio circuitry carries out the decoding of subaudible signals
(e.g. DCS, CTCSS).
5.
The Audio circuitry adds header data to the signals and passes them
to the packet switch.
6.
The packet switch switches the signals to the G.711 encoder.
7.
The G.711 encoder turns the signals into G.711 speech packets and
passes them on to the voter.
From the Analog
Line
The analog line can be used to make a call in digital P25 or in analog FM
mode. The current calling profile determines which type of call is made.
shows a call being received on the analog line when the calling
profile specifies digital P25 mode.
Figure 8.6
Path from receiver to voter (analog FM 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
Summary of Contents for TB9100
Page 1: ...MBA 00002 05 Issue 5 May 2006 TB9100 base station Installation and Operation Manual...
Page 6: ...6 TB9100 Installation and Operation Manual Tait Electronics Limited May 2006 Glossary 131...
Page 26: ...26 Description TB9100 Installation and Operation Manual Tait Electronics Limited May 2006...
Page 34: ...34 Maintenance TB9100 Installation and Operation Manual Tait Electronics Limited May 2006...
Page 60: ...60 Installation TB9100 Installation and Operation Manual Tait Electronics Limited May 2006...
Page 74: ...74 TB9100 Installation and Operation Manual Tait Electronics Limited May 2006...