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Chapter 3. Theory of Operation
3.1
Overview
This chapter provides additional basic information on the RCU20, DDS20, and IFS20 hardware
and internal operation.
3.2
RCU20 Major Assemblies
The RCU20 Redundancy Control Unit contains the modules that control and monitor the
operation of the M:N Switch System. The RCU20 is composed of the following major assemblies
and components:
•
Central Processor Unit (CPU) Board
•
Front Panel Board
•
Controller Interface Module
•
Clock Distribution Module (optional)
•
Redundant Power Supplies
•
Ethernet Module (optional)
•
Bank Control Module
3.2.1 Central Processing Unit (CPU) Board
The Central Processor Unit (CPU) Board contains the M:N Switch intelligence and memory
circuitry. The on-board microprocessor is an MC68302, which has a 24-bit address bus and a 16-
bit data bus. The microprocessor controls and coordinates all major functions of the Switch and
performs all necessary calculations. The non-volatile system memory on the board stores the
switching parameter settings for each Modem Channel. Control and data signals are routed to the
appropriate devices in the system through various latches and transceivers that are controlled by
the microprocessor.
3–1
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