Mitel SX 200 DIGITAL Pabx General Descriptions Manual

							4. SYSTEM REQUIREMENTS4.1 The environmental and electrical requirements for the SX-200 Digitat
PABX are shown in Table 4-1 and Table 4-2 respectively.Table 4-l Environmental Requirements
Height Per Cabinet96.0 cm
Width Per Cabinet60.0 cm
Depth Per Cabinet70.0 cm
Weight Fully Loaded230 kg
Operating Temperature
loto40~CStorage Temperature-20 to 
500 c
Relative Humidity (Operating)20 to 80%
(non-condensing)
Relative Humidity (Storage)lotogo%(non-condensing)
38.0 inches
23.5 inches
27.5 inches
500 pounds
50 to 
1040 F
4 to 1220 F
20 to 80%
10 to 90%
Table 4-2 Electrical Requirements
AC Input Voltage102-l 35 or 204-270 
Vat
AC Input Frequency
AC Input Power
DC Output Power
Reserve Power47-63 Hz
125 Watts RMS for each bay
100 Watts for each bay
Uninterruptable Power Supply (or Battery 
Back-
UD Unit in analoa Perioheral cabinet only)9 109-094-l 00-NAIssue 3 Revision 1100 
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							General Description
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100 4-29109-094-lOO-NA Issue 3 Revision 1 
						

							5. HARDWARE OVERVIEWGENERAL
5.1 The heart of the system is the Main Controller, 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.
In the 
336-, 456-, and 480-Port configurations, the MCC controls digital Bays
1 and 2 directly.
’In the 336-pot-t configuration, the MCC controls Bays 3 and 4 through their
Bay Control Cards.In the 456-port 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 
480-port configuration, the MCC controls Bays 3, 4, and 5 through
three 
DlCs which communicate with the Main Control Card via the DX mod-
ule.tn 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.
MAIN CONTROL CARD
5.2 The Main Control Card (MCC) performs call processing and maintains
overall control through communication with the Bay Control card or Periph-
eral Control card in each bay. In 
336-, 456-, and 480-port systems, the MCC
directly controls Bays 1 and 2 (COMBO backplane only). The architecture of
the Main Control Card varies according to system configuration; for example,
in a 672-port system, some system functions normally performed by the MCC
are controlled through the Switch Matrix Card (the DX module is removedfrom the MCC in a 672-port configuration).
SWITCH MATRIX CARD
5.3 The Switch Matrix Card (SMC) is required only for a 672-port 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 in-
stalled on the MCC when a SMC is present.
FLOPPY DISK DRIVES
5.4 All system software and Customer Data is stored on two 5.2Einch floppy
disk drives. Upon power-up, Call Processing and Maintenance routines are9109-094-l 00-NAissue 3 Revision 
1100 5-l 
						

							General Descriptiondownloaded from the disk to the Main Controller Memory using Direct
Memory Access (DMA).
BAY CONTROL CARD
5.5 The Bay Control Card (BCC) interfaces the peripheral cards of digital bays
to the MCC (one BCC for each Bay, except Bays 1 and 2 of a 
144-port Control
backplane).
II
PERIPHERAL CONTROL CARD
5.6 The Peripheral Control Card (PCC) controls all basic functions of the ana-
log Peripheral Cards. The Peripheral Control Card also handles real time tasks,
such as rotary digit collection, tone cadencing, signaling on trunks, and moni-
toring hardware activity via the Peripheral Control Bus. All events are re-
ported to the Main Controller via the Message Subsystem.
DIGITAL INTERFACE CARD
5.7 The Digital Interface Card (DIG) provides an interface between the analog
signals on the speech paths of the analog peripheral bays and the digital 
PCM
links to the DX Module on the MCC. The DIC converts analog signals in the
300Hz - 3kHz band to PCM signals at 64 kilobits per second. The DIC accepts32 analog voice inputs to provide a 2.048 Mbit/s (32 X 64 
kb/s) PCM output bit
stream to the DX module. It also converts a 2.048 Mb/s PCM bit stream from
the DX Module to 32 analog voice signals, and provides the Message Subsys-
tem interface.
SCANNER CARD
5.8 The Scanner Card scans the Analog Peripheral ports to detect signals that
require processor action. When processor action is required, an Interrupt Re-
quest is sent to the Peripheral Processor.
PERIPHERAL CARDS
5.9 Digital Peripheral Cards measure 35.8 cm (14.1 inches) long and 15.8 cm
(6.2 inches) high, and consist of the following:
Universal Card. This card holds up to four modules as listed below:
0Receiver/Relay Module (4 DTMF Receivers and 2 Relays per Module)
lMusic On Hold/Pager Module (one music input, one paging output)l
Console Module (interfaces to one console)100 5-2lE&M Trunk Module (one trunk).
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							Hardware Overview
Each module is assigned a power rating. The cumulative ratings of the mod-
ules on the Universal card cannot exceed a value of 10. The ratings of the
modules are 
as follows:
o Receiver/Relay Module: 2
lMusic On Hold/Pager Module: 1l Console Module: 
5l E&M Trunk Module: 3
For example, a Universal Card could be configured with two Console Modules(5 + 5 =
lo), or one Console Module, two Receiver/Relay Modules, and oneMusic On Hold/Pager Module (5 + 2 + 2 + 1 
= 10).
ONS Line Card. There are 12 DTMF/Rotary line circuits per card. The card ac-
cepts up to three industry-standard DTMF/Rotary telephone sets per line cir-
cuit. The ONS line card interfaces the telephone analog input with the sys-
tern’s digital crosspoint network. It converts the analog telephone signals
into the digital format used by the system, and converts the digital informa-
tion back into the analog signals required by the telephone sets. This is a low
power card that may be installed in any digital peripheral slot.
Digital Line Card. The Digital Line Card (DLC) interfaces SUPfRSET3DN tele-
phones, 
SUPERSET 4DN telephones, asynchronous DATAS,ETs, synchronous
DATASETs, and the SUPERCONSOLE 1000 attendant console to the SX-200Digital PABX through its Digital Network interface Circuits (DNIC). Each 
DNIC
communicates via a tip-ring pair to a device which also communicates via a
DNIC; the 
DNIC is a proprietary integrated circuit. The card has 12 circuits,
and is a low power card that can plug into any digital peripheral slot.If a
5UPERCONSOLElOOCJ attendant console is plugged into a DLC, that DLC must
be installed in a high power slot.
LS/GS Trunk Card. The LS/GS Trunk Card contains six loop start or ground start
trunks (jumper-selectable) and six message registration inputs. This is a low
power card that may be installed in any digital peripheral slot.
Control Over Voice (COV) Line Card. The COV Line Card interfaces a
SUPERSET telephone or a SUPfRSET4 telephone to the PABX. Each COV card
connects six 
SUPERSETtelephones to the PABX. This is a high power card
which can only plug into an upper digital peripheral slot.
Direct !nward Dial (DID) Trunk Card. The DID trunk card contains sixl-way
Direct Inward Dial circuits. The DID trunk allows incoming trunk calls to dialdirectly to an extension within the PABX without Attendant intervention. It
plugs into an upper (high power) slot of any digital Bay.
Off-Premise (OPS) Line Card. The OPS line card interfaces the PABX to exten-
sions which are part of the system, but are located in a different building
from the PABX. It contains additional protection circuitry to protect the PABX
from 
extraneous high voltages or induced currents that may appear on the
line. Each OPS card has six circuits which each connect to an extension. The
OPS line card plugs into an upper (high power) slot of any digital Bay. 
						

							General Description
Tl Trunk Card. The Tl, Trunk Card provides an interface to one 24-channel (D4
format) 
Tl trunk. It is a high power card; because of signal cable restrictions itmust be positioned in slot 6 (slot 4 of COMBO Bay 2). 
Tl trunks are not avail-
able with Generic 1002.
5.10 The analog Peripheral cards, each measuring 32.5 cm (13 inches) long
and 25.0 cm (10.0 inches) high, consist of the following:
&station Line Card. This card connects to up to eight DTMF/Rotary telephone
sets.
CO Trunk Card. This card connects to four CO trunks 
(LS/GS).
SUPERSFT’ Line Card. This card connects to up to eight SUPERSET or
SUPERSET electronic telephone sets (maximum of eight cards per cabinet).
E 
& M Trunk Card. This card provides two 2- or 4-wire E & M tie trunks.
DID/Loop Tie Trunk Card. This card provides two Direct Inward Dial trunks or
loop tie trunks.100 5-4
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							6. SOFTWARE OVERVIEW6.1 The SX-200 Digital PABX software is divided into two separate sections,
one to run the Main Control processor and one to run the Peripheral Control
processors.
Upon power-up, Call Processing and Maintenance routines are downloaded
.
from the disk to the Main Controller Memory using Direct Memory Access
(DMA). The Main Controller executes the Maintenance routines and logs all
’
major occurrences to the disk, non-volatile random access memory, Main
Control Card 
7-segment displays, and the maintenance terminal (if
equipped).
When the system is functional, the software relevant to the peripheral sys-
tems is downloaded from the Main Controller Memory to each Peripheral
Controller’s Memory. The transfer is accomplished via the Message Subsystem
link, using a single 64 
kilobit per second channel in each direction, for each
Peripheral Controller (Peripheral Control Card or Bay Control Card).
6.2 Each software section has its own layers to carry out system 
functionsThe
layers defined below applyto both controllers unless otherwise specified.PHYSICAL 
LAYER-
6.3 The physical layer consists of the-operating hardware such as the micro-
processor, its associated memory, and input/output devices.SCHEDULING LAYER
6.4 This layer provides for scheduling of the different events to be handled.COMMUNICATIONS LAYER
6.5 This layer takes care of the Message Subsystem software. The messages
between the processors are sent in HDLC formatted packets. The formatting,
sending, receiving, and unpacking of these messages is handled by the Mes-
sage Subsystem software. Messages are transmitted using a single 64 
kb/s
channel in each direction. If required, the transmission rate can be increased
to 128 
kb/s by using two channels.MESSAGE SUBSYSTEM
6.6 The Message Subsystem is used as a communication link between the
Main Controller and the Peripheral Controllers. Initially the Message Subsys-
tem is used to download software from the Main Controller memory to the
Peripheral Controllers’ memory using one or two channels per peripheral bay.9 109-094-l 00-NA
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							General Description
During system operation, a single channel is used as a communication link
between the Main and Peripheral Processors. Messages are sent in HDLC for-
matted frames, ensuring error-free transmission of data.
DEVICE INPUT/OUTPUT LAYER
6.7 This layer handles low level details of interfacing to input/output devices
such as telephony devices and RS-232 ports.
UTILITIES LAYER
6.8 This software layer provides general utilities needed for resource man-
agement, error handling, and command interpretation.
MAIN CONTROL PROCESSOR APPLICATIONS SOFTWARE
6.9 The Main Control Processor Applications software is responsible for con-
trolling all activities in the 
Sx-200 Digital PABX. It communicates with the
peripheral processors via the Communications software layer for such things
as “origination”, “digits received”,
etc. It also interprets Classes of Service,
System Abbreviated Dial, Personal Speed Call, Automatic Route Selection, etc.
The Main Control Processor software controls all Call Processing, Customer
Data Entry, and Maintenance management applications.
PERIPHERAL CONTROL PROCESSOR SOFTWARE
6.10 The peripheral processor handles tasks that are real-time intensive, such
as 
debouncing switchhooks, collecting rotary dial pulses, tone cadencing, and
signaling on trunks. The peripheral processor is also responsible for monitor-
ing hardware activity, such as cards being added and removed, and reporting
all events to the Main Control Processor via the Message 
Subsystem.The Main
Control Processor acts as the manager of the tasks performed by the Peripher-
al Control Processor.
DATABASE
6.11 The Call Processing software is stored on floppy disk. Upon system pow-
er-up, the disk data is transferred to the Main Control Dynamic Random Ac-
cess Memory. Customer Data Entry information is kept on floppy disk for re-
trieval in case of major system failures. Other system information such asswitchhook flash timing, trunk timings, and rotary digit translation for differ-
ent countries, is routed to the Peripheral Control systems for processing.100 6-2
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							7. MAINTENANCEGENERAL
7.1 This Part briefly describes the maintenance diagnostics for the SX-200
Digital PABX. These diagnostics test the operation of the system hardware.
The Main Control system has the responsibility of controlling and scheduling
the diagnostics.7.2 Upon power-up or reset conditions, the diagnostics software (if enabled)
has temporary control of the entire system. Once the system has been verified
and the PABX is operational, the diagnostics run as low priority background
tasks.
MAINTENANCE OBJECTIVES
7.3 The objectives of the maintenance routines are to isolate a fault to a re-
placeable card or module. Maintenance functions can be performed from ei-
ther the Attendant Console or an RS-232 terminal.
RS-232 MAINTENANCE TERMINAL
7.4 The Main Control system interfaces to an RS-232 Maintenance Terminal
and to the Attendant Console in order to enable the user to access the diag-
nostic menu. The diagnostic menu will direct the user through the required
procedures in order to interrogate the status of the diagnostic subsystem.
The user can initiate maintenance routines with specific parameters via the
terminal. The results can then be routed to the appropriate device (printer or
terminal) according to the user’s instructions.
DIAGNOSTIC LOG FILES
7.5 A file of the major occurrences in the diagnostic system is maintained on
disk and/or in non-volatile RAM. This file can be directed to the RS-232
Maintenance Terminal, the Attendant Console, or a printer.
TYPES OF DIAGNOSTICS
7.6 There are three types of diagnostic routines as listed below:l Power-up
l Background
0 Directed
The Power-up diagnostic routines consist of the complete set of diagnostics
for the system. When enabled, they are executed upon system power-up and 
						

							General Description100 
7-2
may last several minutes. These diagnostics will perform a rigorous check on
the response and performance of the hardware and firmware. Any failures
will be logged to the LED display, the disk, the non-volatile RAM, and theRS-232 terminal.
The Background diagnostic routines consist of the complete routines which
are run during system operation. When enabled they are executed as low
priority background routines during system operation.
Directed diagnostics are diagnostic routines that are selected by the mainte-
nance person and then run on specified circuits or devices.
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