Mitel SX 200 ML PABX Instructions Guide

2 Features 
General 
2.1 The SX-200 PABX offers many features which are provided by a software package. A 
full description of these features appears in the Features Description Practice. Certain 
limitations which apply to System Features are listed in Table 2-l. 
Table 2-l Feature Limitations 
I Feature Limitations 
Maximum number of simultaneous calls 
48 
Maximum number of speech paths or channels used by any call 
2 
Max. number of simultaneous consultations 
5 
Maximum number of simultaneous add-on...

Engineering Information 
Table 2-l Feature Limitations (continued 
2-2 Issue 1 Revision 0 March 1997  

3 System Overview 
General 
3.1 SX-200 ML LIGHTWARETM 16 software is available in a base load plus optional fea- 
tures. The password on the System ID module enables optional features. Software is 
not operational without the System ID module. SX-200 ML UG/-/TwA/?E 16 features 
include: 
ANI and DNIS 
Hotel/Motel 
Property Management System 
Automated Attendant 
ONS Voice Mail 
Printing 
Automatic Call Distribution (ACD) 
Key Sets - Off-Hook Voice Announce. 
Maintenance 
3.2 Modular design and functional...

Engineering Information 
3-2 
Issue 1 Revision 0 March 1997  

4 Technical Description 
General 
4.1 The SX-200 ML PABX uses Pulse Code Modulation (PCM) time-division multiplexing 
as its digital conversion format. The PABX employs both digital peripheral cards 
and 
digitally-interfaced analog peripheral cards. System architecture is illustrated in 
Figure 4-l. The major component blocks are described in the paragraphs below. 
Circuit Switch Links 
4.2 The subsystems of the PABX communicate over 2,048 kHz serial links. Each link is a 
continuously repeated data...

Engineering information 
The PABX uses another custom VLSI circuit as its main PCM switching matrix element 
- the 8 link x 32 channel MT8980 Digital Time/Space Crosspoint Switch (DX Chip). 
The DX device is arranged with eight incoming links and eight outgoing links; each link 
comprising 32 channels. Under control of the main CPU, any channel of the incoming 
links can be connected to any channel of the outgoing links. Thus, one DX chip is 
equivalent to a 65,536 (256 x 256) crosspoint array. 
The...

Technical Description 
Message Subsystem 
4.6 The message subsystem facilitates the transfer of control messages and program 
loading between the main Peripheral Control Processor and lower node processors 
such as Bay Control Cards, SUPERSET telephones, and consoles. This transfer of 
information occurs over the PCM links of the Circuit Switch Matrix. The protocol used 
in the message system is based on the OSI (Open Systems Interconnection) widely 
used HDLC (High Level Data Link Control) protocol...

Engineering information 
Peripheral Interface Cards 
4.7 
Peripheral interface cards provide an interface between the terminations of the PABX 
(lines and trunks) and the circuit switch. The card type depends upon the type of 
peripheral interfaced to the system; i.e., an E&M Trunk card caters to E&M trunks 
only. 
The number of interface circuits that each card provides varies with the type, complex- 
ity, and space requirements of the circuit. A description of the peripheral interface cards 
is...

5 Circuit Card 
Descriptions 
General 
5.1 This chapter describes the cards used in the SX-200 ML PABX. 
Main Control Card II 
Description 
5.2 This section describes the Main Control Card II (MCC II). There are two variants of the 
MCC II, one with a Stratum 4 clock (part number 9109-070-OOO-NA), the other with a 
Stratum 3 clock (part number 9109-070-001 -NA). 
The MCC II and the Switch Matrix perform all call processing for the entire system. 
CAUTION: Do not insert or remove the Main Control Card II...

Engineering Information 
5-2 
software contained in its flash memory. This test software consists of tests for the RAM 
memory, the CPU and the DMA controller. A routine to load the system software into 
RAM from flash memory is run only after all preliminary tests have been passed. 
RAM 
Btief Description 
The RAM carries the dynamic memory required for program storage and call process- 
ing work areas. 
Switch Matrix 
Brief Description 
The Switch Matrix is integrated into the Main Control Card Il....