Main Control Card; Description; Facilities; Message - Mitel SX-200 Manual

2. MAIN CONTROL CARD

D e s c r i p t i o n

Facilities

2.01 The Main Control card performs all call processing for the
entire system, and peripheral control operations for Bays 1
2. It maintains overall control through communication with the Bay
Control card or Peripheral Control Card in each bay.
2.02
Facilities on the Main Control Card are:
l
HDLC link for high speed message communication and bulk
data transfers to peripheral processors or Bay Control cards
and Digital line cards
l Two RS-232 communication
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
l
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
l
Digital signal processor to generate and detect progress and
ringing tones
RAM Module for program storage and process work areas
l
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).
ports (one
and to provide conferencing
Circuit Card Descriptions
printer port, one
Page 3
and
main-