Audio Signaling Processor
Page 8 of 26
MX803A PRELIMINARY INFORMATION
4.2.4 MX806A Audio Processor
This is a half duplex audio processor providing all DBS800 system audio signal conditioning and filtering
capabilities for the system transmit and receive paths.
4.2.5 MX809 MSK Modem
This is an intelligent, half-duplex 1200bps MSK/FFSK Modem with software programmable byte-
synchronization system and checksum generation and checking.
4.2.6 MX812 VSR Codec
This is a half-duplex CVSD speech encoder/decoder with the ability to store and retrieve data within attached
DRAM (Dynamic Random Access Memory) using an on-chip DRAM controller
4.3
C-BUS Control
C-BUS is the controlling hardware and software interface for all members of the DBS800 family. It enables
the serial, bi-directional transfer of commands and data throughout the system, allowing total flexibility of
operational control and data handling. System upgrades can be achieved by a simple software or firmware
change.
The C-BUS physically consist of 5 lines. These lines are Serial Clock, Command Data, Reply Data, Chip
Select (
CS
), and Interrupt Request (
IRQ ). A description of each may be found in section 2.
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