Chapter 5 MTR3000 Station Control Module
5.1 Description
The Station Control Module (SCM) is described in this section. A general description, identification of
controls, indicators, and inputs/outputs, a functional block diagram, and functional theory of
operation are provided. The information provided is sufficient to give service personnel a functional
understanding of the module, allowing maintenance and troubleshooting to the module level.
5.1.1 General Description
The SCM circuitry performs the digital signal processing, data formatting and audio routing for the
MTR3000 Base Station/Repeater (BR) and provides the external interfaces to the rest of the site.
The SCM uses two TI OMAP1710 processors
• One for transmit and overall base station/repeater control functionalities
• One for all receive functionalities
Both OMAP1710 processors have independent boot Flash and RAM and, therefore can boot
independently.
General SCM functionality includes:
• Data and Control interface to the Receiver’s Abacus III devices
• Data and Control interface to the Receiver’s Trident chip set
• Data and Control interface to the Exciter’s Trident chip set
• Audio Codec interface with MAKO IC
• Host memory size, speed, and types supported
• External ports (Ethernet, USB, speaker and microphone)
• External physical interfaces (connectors, LEDs, external references etc.)
• Tx/Rx DSP Multi-Channel Buffered Serial Port (MCBSP) interfaces
• Intermodule communication (using SPI)
• Internal station reference generation
- OCXO (DLN6718)
- TCXO (DLN6719)
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