Mitel SX-200 Documentation page 17

followed by the required Class-of-Service code. All data entries into
the system may be made from the attendant or maintenance console.
To prevent the loss of customer data in the event of a power failure,
the memory holding the data associated with each line or trunk is
equipped with its own reserve power supply. This power supply is
sufficient to maintain the memory intact for a period of 1 week.
3. SYSTEM OPERATION
3.01 The SX-lOO/SX-200 system is a solid-state PABX employing
space-division
processing. A block diagram of the system is shown in Figure 3-l. The
SX-100 system has a capacity of 112 ports and the SX-200 system
has a capacity of 208 ports, which may be assigned to receivers, lines,
and trunks. The ports are scanned sequentially for detection of signals
every 3.2 milliseconds.
3.02 Call origination is detected during scanning, an interrupt signal
to the microprocessor is generated and a speech path and
receiver are assigned to the originating station. After dialing, the re-
ceiver is released and the called party is connected to the same
speech path as the originator. There are 31 speech paths and one
Figure
SECTION MITL9105/9110-096-l OO-NA
switching and
2-7 Attendant Console
microprocessor control of call
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