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through the inter-processor communication system.
POWER detects the voltage drop of the AC input and the DC output and transfers it to MPR.
8.1.1. MPR Card
This card is the main control section of this unit. It controls all the cards mounted on the free
slots, and communication of RS-232C ports.
The front of the MPR card is equipped with two LEDs (LED1 and LED2) that indicate the
operating status of this card, two rotary switches used to decide a system operation mode, and
a push switch used to execute the system reset.
This control circuit execute the control signals for the exchange process, and this card is
composed of the following
(A) 32bit CPU (32bit data bus)
(B) SDRAMs, SRAMs
(C) Flash memorys
(D) Lithium Battery for back-up of clock IC and Static RAMs
8.1.2. Back Board
BB (back board) is the mother board of the basic shelf. This board connects each card
(POWER, MPR, and optional cards) together. This board has one RS-232C connector.
8.1.3. Power Supply Unit
This unit is switching regulator power supply and supplies DC voltages to MPR card, optional
card (free slot).
8.2. SYSTEM CONTROL
8.2.1. System Control Block Diagram
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