Hardware Overvlew; General; And 672- Port Configurations; 100 4-L - Mitel SX-200 Practices

4
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HARDWARE OVERVIEW
General
4.1 The heart of the system is the Main Control Card (MCC), a 16--bit microprocessor
,operating at a clock frequency of 8 megaHertz. The Main Controller, through its
address, data, and control buses, interfaces to a floppy disk unit, memory, Direct
Memory Access Controller (DMAC), a Digital Signal Processor (DSP), a Message
Subsystem, and a DX Matrix or Switch Matrix Card/Module.
In the 336and 456Port configurations, the MCC controls digital Bays 1 and 2 directly.
In the 336-part configuration, the MCC controls Bays 3 and 4 through their Bay Control
Cards.
In the 456-par-t configuration, the MCC controls Bay 3 through its Bay Control Card,
'and controls Bays 4 and 5 through two Digital Interface Cards (DIC) which
communicate with the Main Control Card via the DX module.
In the 48O-pot-t configuration, the MCC controls Bays 3, 4, and 5 through three DlCs
which communicate with the Main Control Card via the DX module.
In the 672-port configuration, the MCC controls Bays 1 through 7 through their Bay
Control Cards; Bay 0 (which has no peripheral cards) is controlled directly through the
Bay 0 backplane.
In the SX-ZOO FD system configuration, the MCC controls the digital bay in each
Peripheral cabinet through the Peripheral cabinet's Bay Control Card.
336,456,48&, and 672- Port Configurations
4.2
The 336, 456-, 480-, and 672-port configurations have the following main
hardware components:
Main Control Card (MCC)
- performs call processing and maintains overall control
through communication with the Bay Control card or Peripheral Control card in each
bay. In 336 and 456-par-t systems, the MCC directly controls Bays 1 and 2 (COMBO
backplane only). The architecture of the Main Control Card varies according to system
configuration.
Switch Matrix Card (SMC)
- required only for a 672-par-t system; it is installed in Bay
0. It is used to expand the DX switching matrix which in other configurations is located
on the Main Control Card. A DX Module is not installed on the MCC when a SMC is
present.
Floppy Disk Drives
- two floppy disk drives store all system software and Customer
Data. Upon power-up, Call Processing and Maintenance software are downloaded
9109-09~10O-NA Issue 1 Revision 0 100 4-l