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Mitel SX 200 DIGITAL Pabx Superset 3 Telephone Description Manual

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    							SECTION MITL9109-094-125-NA .
    vi 
    						
    							Circuit Card Descriptions
    1. INTRODUCTION
    General1 .OlThis Section describes the digital cards in the SX-200@ DIGITAL
    PABX. Figure 
    1-I shows the front faces of some of these digital
    cards.
    Reason for Issue
    1.02This Section is issued to provide a general description of the
    digital circuit cards in the SX-200 DIGITAL PABX.
    Page 1 
    						
    							SECTION MITL9109-094-125-NA
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    MOD3ULE0
    						
    							Circuit Card Descriptions
    2. MAIN CONTROL CARD
    Description2.01The Main Control card performs all call processing for the
    entire system, and peripheral control operations for Bays 1 and
    2. It maintains overall control through communication with the Bay
    Control card or Peripheral Control Card in each bay.
    Facilities
    2.02
    l
    l
    0
    0
    l
    l
    0
    lFacilities on the Main Control Card are:
    HDLC link for high speed message communication and bulk
    data transfers to peripheral processors or Bay Control cards
    and Digital line cards
    Two RS-232 communication ports (one printer port, one main-
    tenance port)
    Floppy Disk Control including data separation and 
    write pre-compensation
    DMA controller for dynamic RAM refresh, data transfer to floppy
    disk and HDLC communication system
    Real Time Clock for time of day and interrupt generation, with
    3-day non-volatile backup
    System PCM Clock Generation
    Memory: Dynamic RAM (on RAM Module) with parity detection,
    3-day non-volatile CMOS RAM, EPROM
    Digital signal processor to generate and detect progress and
    ringing tones and to provide conferencing
    RAM Module for program storage and process work areas
    DX Module (digital time/space crosspoint switch) for circuit and
    message switching
    Decryption Module to enable use of protected software
    Fault detection hardware to monitor PCM clock and processor
    sanity (watchdog)
    System Reset switch (front panel).
    Page 3 
    						
    							SECTION MITL9109-094-125-NAOperation
    2.03The Main Control Card (MCC) must not be inserted or removed
    with the power on. Damage to 
    onboard circuits may result.
    2.04 The correct Decryption Module must be installed, or the disk
    software will not run.
    2.05At power-up the Main Control Card is held reset for about 1
    second after the power supply voltages reach their normal
    levels. After reset, the processor first runs the software contained in
    its EPROM. This consists of tests for the RAM memory, the CPU and
    the DMA controller. A routine to load the system software into RAM
    from disk is run only after all preliminary tests have been passed.
    2.06The Main Control Card may also be reset via the pushbutton
    switch behind the front panel of the card near the top. Reset
    invokes Power Fail Transfer, which remains in effect until the system
    software has been loaded from disk.
    2.07Parts 3, 4 and 5 describe the modules that plug into the MCC.
    Page 4 
    						
    							Circuit Card Descriptions.
    DECRVPTIONMODULE
    7736EORIFigure 2-1 Main Control Card and Decryption Module
    Page 5 
    						
    							SECTION MITL9109-094-125-NAPage 6 
    						
    							Circuit Card Descriptions
    3. DECRYPTION MODULEBrief Description
    3.01The Decryption Module plugs into the lower front corner of the
    Main Control Card. The Decryption Module must be present
    during power-up and system operation. Figure 2-1 shows the location
    of the Decryption Module on the Main Control Card. There are 3
    Decryption Modules for Generic 1003, as follows:
    aFK3 - Basic System
    l
    FK4 
    - ACD
    0FK5 - ACD + Reports
    Operation3.02The Decryption Module is written to and read from constantly
    by the system software. If there is a mismatch between the
    module and the software, the software will not run.
    Page 7 
    						
    							SECTION MITL9109-094-125-NAPage 8 
    						
    							Circuit Card Descriptions
    4. RAM MODULEBrief Description
    4.01The RAM Module carries the dynamic memory required for
    program storage and call processing work areas. It plugs into a
    96-pin DIN connector on the lower part of the Main Control Card.
    Mechanical support is provided by standoffs. The board measures 25.9
    mm x 14.5 mm high (10.6 in. x 5.7 in.).
    4.02Parity is checked on all read and refresh cycles by circuitry on
    the Main Control Card. 
    If. the parity logic detects an error, it
    logs it in CMOS RAM and invokes a system reset via software.
    Page 9 
    						
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