Mitel SX 200 DIGITAL Pabx Superset 3 Telephone Description Manual

							SECTION MITL9109-094-125-NAPage 10 
						

							Circuit Card Descriptions
5. DX MODULEBrief Description
5.01
Facilities5.02
0The DX Module plugs into the upper back corner of the Main
Control Card, using the two 96-pin DIN connectors.
Facilities on the DX Module include:
Main DX Matrix
Peripheral DX Matrix
Dial Tone filter
Bay 1 and 2 access logic.
Electrical Description5.03The Main DX Matrix consists of four 
Mite1 8980 DX chips ar-
ranged in a non-blocking 16 x 16 links. The matrix is capable of
connecting any one of the 32 channels on any one of the 16 incoming
2.048 MHz links to any one of the 32 channels on any of the 16
outgoing links.
5.04The Peripheral DX Array consists of three 
Mite1 8980 DX chips.
It forms 8 x 24 concentrating/expanding links between the Main
DX matrix and the 14 peripheral cards. Eighteen links go to and from
the combo backplane.
5.05The Ringing Generator receives PCM data for the ringing signal
from a 7720 Signal Processor on the Main Control Card. It is
converted to an analog signal by a 
Mite1 8960 Codec. This signal is
filtered to remove fast rise time transients and passed through the
backplane connector to the ringing power amplifier in the power 
sup-
PlY.5.06The Dial Tone Filter consists of a 
codec and an analog filter
circuit. The PCM dial tone is converted to an analog signal,
filtered, and reconverted to PCM.
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							Circuit Card Descriptions
6. Tl CLOCK MODULE
Brief Description
6.01The Tl Clock Module is a digitally controlled oscillator which
synchronizes the system clock to an incoming 
Tl frame rate
clock signal.The 
Tl Clock Module plugs into the SX-200 DIGITAL Main
Control Card.
Electrical Description
6.02Every 100 ms the 
Tl Trunk card sends a counter value repre-
senting the phase difference between the incoming 
Tl clock
and the SX-200 DIGITAL system clock. On the 
Tl Clock Module a
Digital to Analogue converter generates a corresponding voltage to
control the clock oscillator. This forms a phase-locked loop which
keeps the clocks in phase.
Physical Description
6.03The card measures approximately 8 cm x 11 cm (3.2” x 4.3”). It
connects to the Main Control Card via a 30-pin connector.
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							Circuit Card Descriptions
7. BAY CONTROL CARD
General7.01The Bay Control Card is required in the lower rightmost slot of
all digital bays, except Bays 1 and 2. On 672-port systems, a
Bay Control card is required in every bay. This card must NOT be
inserted or removed with the power on. The card measures 158 mm x
368 mm (6.2 in. x 14.5 in.).
Functions
7.02The Bay Control card provides:
0Control of operations within the Bay
lMonitoring of lines, trunks and other circuits within the bay;
reports are sent to the Main Control Card via HDLC message
links
lRinging signal conversion. (The waveform comes from the Main
Control Card as a PCM signal).
indicators
7.03 The Bay Control Card has Alarm LED TX (transmit) and Rx
(receive) indicators for HDLC message link.
Electrical Description
7.04Electrical connection between the Bay Control and the circuit
cards is through the peripheral backplane. Connection to the
Main Control Card is via PCM cables. The PCM cable connector is on
the rear of the backplane, behind the Bay Control location. There is
room for two more cables for future applications.
7.05There are two pairs of switches on the card. See Figure 7-1. All
four switches must be closed for normal operation.
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							SECTION MITL9109-094-125-NA
u.
U0129ElRl
Figure 7-l Bay Control Card
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							Circuit Card Descriptions
8. PERIPHERAL CONTROL CARD
Brief Description8.01The Peripheral Control card is located in slot 20 of an analog
peripheral shelf. It controls the analog cards on instructions
from the Main Control Card. Figure 8-l shows the front faces of the
Peripheral Control Card, the Scanner and Digital Interface cards and
the Main Control Card.
Major Components
8.02
l
l
lFacilities
8.03
0Major components provided by the Peripheral Control Card in-
clude:
6809 microprocessor running at 1.33 MHz
Memory: 8K EPROM, 32K RAM
Peripheral Clock Oscillator.
Facilities for the Peripheral Control Card include:
Peripheral I/O Timing Generator for the bays it controls
Peripheral Address Decoder
FIRQ Interrupt Timer/Generator
Power Fail Monitor: a local bay reset is generated if any power
rail drops below 95%. of its nominal level.
Status Flag Buffer.
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							SECTION MITL9109-094-125-NASYSTEM
RESET 
-BUTTONPLANE
TRANSFER-BUTTON
*INOR
-Me4AJoRUAFIM0
RlncAl !AARM01MAlNCTLCARD-EXTRACTOR
MAIN CONTROL
CARDBAV CONTROL
CARD7-SEGMENT
DISPLAYS

						

							Circuit Card Descriptions
9. DIGITAL INTERFACE CARD
Brief Description9.01The Digital Interface card is installed in slot 18 of an analog
peripheral shelf. It interfaces the analog shelf to the Main Con-
trol card. The card is illustrated in Figure 9-l.
Facilities
9.02Facilities for the Digital Interface card include:
lanalog/digital and digital/analog conversions between the ana-
log junctors and the Master Control card via the PCM cable.
aenables dial pulse detection by the Peripheral Control card. Dial
pulses cannot be encoded in PCM.
aprovides a message channel between the Main Control card and
the Peripheral Control card via the PCM cable.
Connections
9.03The Digital Interface card is installed in slot 18 of an analog
peripheral shelf. It must not be inserted or removed from the
system with the power on. The card front panel contains three 21-pin
male DIN connectors and two 
LEDs. A PCM cable from the Main
Control is plugged into J2.
9.04A 2-shelf peripheral cabinet may have a Digital Interface card
installed in both the top and bottom shelves. In this case, the
cable from the Main Control card plugs into J2 of the lower 
DIG. An
intershelf jumper cable connects 
Jl of the lower DIC to J3 of the upper
shelf DIC. The upper shelf card performs only the analog/digital inter-
face and dial pulse detection functions. When connected this way, the
cards automatically identify their location to the main processor.
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