Main Control Card; Description; Facilities - Mitel SX-200 Practices

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MAIN CONTROL CARD
Description
2.I
This section describes the Main Control Card (MCC) and the modules that plug into
the MCC.
The Main Control Card performs all call processing for the entire system, and peripheral
control operations for Bays I and 2 of the 336-par-t and 456-pat-t SX-2UO DIGITAL. It
maintains overall control through communication with the Bay Control Card or
Peripheral Control Card in each bay (456-pott configuration only). The Main Control
Card and the Switch Matrix Card perform call processing for the 672-port SX-2OU
DIGITAL. The Main Control card and the Switch Matrix Module perform the call
processing for the 672-pot-t SX-2UO FD.
Do not insert or remove the Maln Control Card (MCC) with the power on. Dam-
age to onboard circuits may result.
Facilities
2.2 Facilities on the Main Control Card are:
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HDLC link for high speed message communication and bulk data transfers to pe-
ripheral processors or Bay Control cards
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Two W-232 communication ports (one printer port, one maintenance port)
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Floppy Disk Control including data separation and write precompensation
* DMA controller for dynamic RAM refresh, data transfer to floppy disk and HDLC
communication system
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Real Time Clock for time of day and interrupt generation, with 3-day non-volatile
backup
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System PCM Clock Generation
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Memory: Dynamic RAM (on RAM Module) with parity detection, 3-day non-volatile
CMCS RAM, EPROM
., Digital signal processor to generate and detect progress and ringing tones and to
provide conferencing
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RAM Module for program storage and process work areas
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DX Module (digital time/space crosspoint switch) for circuit and message switching
(used for the 336-part and 456port SX-200 DIGITAL)
0 Switch Matrix Module (digital time/space crosspoint switch) for circuit and message
switching (used on the SX-200 FD)
9109-09&125-NA Issue 1
Revision
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