Mitel SX 200 DIGITAL Pabx Superset 3 Telephone Description Manual

							SECTION MITL9109-094-125-NA17.08 When the telephone is off-hook, the line circuit status LED on
the front panel lights. The line circuit maintains a constant 26
mA current to the telephone while the set is off-hook. Loop length is
maximum 600 ohms including the telephone set.
17.09 The ONS line card supports the Message Waiting feature. A
high voltage (-140 Vdc) is applied to the Ring terminal of the
line, lighting a neon lamp on the subscriber’s set.
Operation
17.10 When a telephone goes off-hook, the line circuit detects the
flow of loop current and signals the Main Processor. The pro-
cessor responds by connecting a DTMF receiver to the line and send-
ing dial tone to the set. (If the telephone uses pulse dialing the
processor detects the pulses by monitoring the loop current). The user
can then dial the desired number.
17.11 When a call is directed to an extension, the system applies
ringing voltage to the appropriate line and monitors the loop
current for an off-hook condition. When the telephone is answered, the
ringing voltage is removed.
17.12 When a call is ended by one of the sets going on-hook, the call
is disconnected and the line returns to its idle state.
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							Circuit Card Descriptions
18. OPS LINE CARD
Brief Description
18.01 The OPS Line Card contains six Off-Premises line circuits. An
Off-Premises (OPS) Line circuit is used where the line goes
outside the building housing the PABX and may be exposed to ex-
traneous high voltages or induced currents (e.g., lightning).
18.02 The OPS Line card can be used in any digital peripheral bay
high power (upper) slot. The maximum number of these cards is
four per bay. This provides a maximum of 24 ports per peripheral bay.
18.03 The card is 157.5 mm high x 366.4 mm long (6.2 in. x 14.4 in.).
Major Components18.04Major components for the OPS Line Card are:
Mite1 8962 Filter/Codec (six)
2-wire 
/ 4-wire converter (six)
Ringing relay (one per circuit).
Facilities
18.05
0
lEach line circuit provides the following facilities:
Line activity LED
Alarm LED
Line protection
0Analog-to-Digital / Digital-to-Analog conversion (Jaw)
Signaling (ringing).
Operation18.06
panel
18.07Each circuit has a LED on the front panel which lights to in-
dicate the line is in use. A seventh LED at the bottom of the
lights to indicate a failure on the card.
The line circuit applies Forward Battery Feed to the line. The Tip
is grounded and the Ring is at-48 volts. When the set goes
off-hook to place a call, the PABX detects the loop current and re-
sponds with dial tone. Dialing may be DTMF or pulses. Dial pulses are
debounced by software to assure reliable performance.
Page 41 
						

							SECTION MITL9109-094-125-NA18.08 When a call is directed to the set, a relay closes, sending
ringing voltage to the set. The ringing relay drops out when
loop current flow indicates that the telephone has been answered.
(Off-hook condition).
Electrical Description
18.09 Line protection comprises high voltage varistors to energy
dump ground from Tip and Ring and fusible links incorporated
in the battery feed resistors. 
EMI is controlled by inductors in series
with Tip and Ring.
18.10 The maximum loop resistance is 1800 ohms. The maximum loop
length is 5850 m (19,200 ft) when using 26 AWG wire, 15,240 m
(50,000 ft) when using 22 AWG wire.
18.11 The card circuitry performs 2-wire to 4-wire conversion, split-
ting the signal on the line into outgoing and incoming speech
paths. The analog signal coming from the line is converted to Pulse
Code Modulation (PCM); the signal to be sent to the line is converted
from PCM to analog audio. These conversions are performed by a 
Mite1
Codec chip.
18.12 The line circuit applies ringing voltage to the appropriate line
through a relay and removes it when the telephone is an-
swered. This is determined by monitoring the loop current.
18.13 Loop current is provided through a pair of 200 ohm resistors.
Below 900 ohms loop resistance, active current limiting cir-
cuitry limits line power to less than 1.5 watts.
18.14 Ringing for each line is controlled by relay 2.
Condition
Relay 1
Idle or Talk
OFFRinging
OFFRelay 2
OFF
ONPage 42 
						

							Circuit Card Descriptions
19. COV LINE CARD
WARNING
ANY CONNECTION OF THIS CARD TO AN OFF PREMISE APPLICA-
TION, AN OUT OF PLANT APPLICATION, OR TO ANY OTHER EXPOSED
PLANT APPLICATION MAY RESULT IN A SAFETY HAZARD, AND/OR
DEFECTIVE OPERATION, AND/OR EQUIPMENT DAMAGE.
General
19.01 The COV Card is installed in a digital peripheral bay to interface
up to six SUPERSEJ 3TMor SUPERSEJ 4@ telephones to the bay
processor. The card measures 158 mm x 368 mm (6.2 in. x 14.5 in.). It
has a profiled edge connector that allows it to be safely inserted or
removed from the system with the power on.
19.02 The COV Card can be mounted only in a high power (upper)
card slot of a digital bay.
Major Components
19.03 The major components of the COV line card are:
lSubscriber line interface circuit (SLIC) hybrid (one per line)
aBackplane interface
aPCM Timer
l6402 UART
a8840 Modem
aLine protection circuits
0Line status LEDs (one per line)
lCard status LED (one).
Facilities
19.04 Facilities provided by the COV line card include:
lAmplitude Shift Keyed communication with SUPERSEJ 3 or
SUPERSEJ 4 telephones
aAnalog/Digital and Digital/Analog conversions (blaw)
0Battery Feed to power sets.
Page 43 
						

							SECTION MITL9109-094-125-NAElectrical Description
19.05 Control information from the backplane is converted to a 32
kHz amplitude shift-keyed (ASK) data stream. The audio in-
formation is taken from the 2 Mb/s data link, converted to analog
audio and combined with the control information for transmission to
the set. Conversely, the audio and ASK data signals from the set are
separated and converted. The ASK data is demodulated and sent to the
bay processor. The audio is digitized and transmitted on the data link.
19.06 There is only one UART and one modem on the card. The six
lines are time-division-multiplexed to the communication cir-
cuit. Transmission and reception are simultaneous, but the card re-
ceives data from the set to which it last transmitted. For example, if
the card is transmitting to set 2, it is receiving from set 1. In the next
time slot, it will transmit to set 3 and receive from set 2.
19.07 The COV card has seven indicators on the front panel. There is
an activity LED for each subscriber line. The LED at the bottom
of the panel is an alarm indicator for the entire card.
19.08 The maximum loop lengths for COV circuits are:
Wire Gauge (AWG)Loop length
261000
m(3300ft)
241500
m(5000ft)
222000
m(6600ft)
Page 44 
						

							Circuit Card Descriptions
20. DIGITAL LINE CARD
WARNING
ANY CONNECTION OF THIS CARD TO AN OFF PREMISE APPLICA-
TION, AN OUT OF PLANT APPLICATION, OR TO ANY OTHER EXPOSED
PLANT APPLICATION MAY RESULT IN A SAFETY HAZARD, AND/OR
DEFECTIVE OPERATION, AND/OR EQUIPMENT DAMAGE.
General Description
20.01 The Digital Line Card (DLC) interfaces asynchronous DATASETs,the Superconsole 
1 OOOTMattendant console, SUPERSET 3TMDNand 
SUPERSET 4TMDN telephones to the SX-200 DIGITAL PABX. It con-
tains 12 asynchronous line circuits (MITEL Digital Network Interface
Circuit), and is a low power digital card which can plug into any slot
within a digital bay.
20.02 The card is 158 mm high x 368 mm long (6.2 in. x 14.5 in.).
20.03 There are 13 
LEDs on the face of the card. The top 12, one for
each line circuit, light when the circuit is in use. The bottom
LED on the panel lights to indicate an alarm condition within the card.
Facilities
20.04 Each Digital Network Interface Circuit (DNIC) provides the fol-
lowing facilities:
lline protection
lfull duplex simultaneous data end voice digital transmission
over a single pair of wire
lline circuit status monitoring
asignaling and HDLC protocol to its associated DATASET.Electrical Description
20.05 Each Digital Network Interface Circuit (DNIC) connects a
DATASET, Superconsole 1000 attendant console, SUPERSET3DN or a 
SUPERSET 4DN telephone to the common circuitry on the
DLC card (and then to the PABX). The common circuitry will be de-
scribed first, followed by a description of one DNIC.
20.06 The common circuitry contains a High-level Data Link Control-
ler (HDLC) which controls the D channel communication be-
tween each 
DNIC and the Main Control Card (MCC) within the PABX.
This data is passed over one-half of a link to the MCC. The 
Bl and B2
channels from the 
DNlCs are multiplexed onto one link between the
DLC and the MCC. The common circuitry includes phase-lock loop
circuitry to keep the 
DNlCs in synchronization with the system clock,
Page 45 
						

							SECTION .MITL9109-094-125-NAas well as circuits which prevent the DLC from disrupting the back-
plane when a card is inserted or removed. The DLC line circuits are
arranged in three groups of four; at power-up, each group can be
separately sequenced. There are 12 Digital Network interface Circuits
(DNIC) on the DLC card, each connected to a separate tip-ring pair.
DNIC Description
20.07 Each 
DNIC connects via its tip-ring pair to a proprietary tele-
phone set, or a proprietary telephone set with a data cartridge,
or a 
DATASET which also contains a DNIC. The DNlCs communicate
with each other over the twisted pair at 160 
Kbit/s (which includes two
64 
Kb/s Bl and B2 channels and a D channel). Since the DNIC is a
proprietary integrated circuit, each device connected to a Digital Line
Card 
DNIC tip-ring pair must also contain a DNIC. The two DNlCscommunicate data plus voice simultaneously in full duplex over the
single twisted pair between them. The twisted pair also carries the
power required by the 
SUPERSET 3DN or the SUPERSET 4DN telephone
from the 
DNIC on the DLC. The DATASET is powered from a separate
AC power supply.
Operation
20.08 The Digital Line Card communicates with a DNIC-equipped de-
vice using digital transmission techniques; a voice channel, a
data channel, and a control channel. It allows simultaneous transmis-
sion of voice and data over a single twisted pair of wires. When the
DLC is connected to 
SUPERSET 3DN or SUPERSET 4DN telephones,
each set may be equipped with a Data Cartridge which can be con-
nected to a personal computer, or similar data device. The set’s voice
operation and the data device’s data operation can both function con-
currently.
LOOP LENGTH SPECIFICATIONS FOR CONNECTIONS TO A DIGITAL LINE
CARD ~
Application:This interface is not intended or approved for
off premises applications.
MaximumAny combination of 22, 24 or 26 AWG wire with
Loop Length:a total length of up to 1000 meters.
Bridge Taps:One bridge tap of any length and located at any
point on the main loop will not significantly
degrade the error performance. A second
bridge tap, depending on its length and location
may significantly degrade the error perfor-
mance.
Note:The main loop and the bridge tap must NOT have any devices
connected to them other than the SX-200 Digital Line Card
and one Digital set or console; the third tip and ring pair must
be unterminated.
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							Circuit Card Descriptions
21. POWER FAIL TRANSFER CARD (6 CIRCUIT)
Brief Description
21.01 The Power Fail Transfer card allows six telephones, defined by
the customer, to place and receive outside calls while the sys-
tem is inoperative due to a power failure or other major fault. The sets
must be industry standard, rotary dial or DTMF, according to trunktype.21.02 Power Fail Transfer cards mount on the right wall of the cabi-
net, as seen from the rear door. Each card contains six circuits.
There can be up to three cards per system, allowing a maximum of 18
PFT circuits. The card is 165 mm high x 267 mm long (6.5 in. x 10.5 in.).
See Figure 21-1.
Connections
21.03 The connections to the Power Fail Transfer card are made
through a 25-pair connector, two 9 pin 
DSUB connectors, a
14-pin strip connector and a four terminal barrier strip.
21.04 The 
amphenol connector provides all the tip and ring connec-
tions from the cross-connect field. The two DSUB connectors
provide control signals, power supply and ground connections. They
are in parallel. One is connected by cable to the Common Control
Shelf; the other cable goes to the next Power Fail Transfer card. The
berg strip connector is, for the optional Loop-to-Ground Start Con-
verter module. The terminal strip is for an external alarm connection.
Electrical Description
21.05 The Power Fail Transfer card connects six extension lines to the
PABX. Under System Fail condition it connects each of these
extensions to a CO trunk, as defined by the customer. This allows
these extensions to place and receive outside calls. When the system
is restored, the extensions 
rev:ert to their normal connection. If a call is
in progress at this time, the affected extension’s return to normal
service is delayed until the call is completed.
21.06 If the CO Trunks to be used for PFT service are of the ground
start type, a Loop-to-Ground Start Converter must be con-
nected to the PFT card.
21.07 Extensions to be used for PFT service cannot be 
SUPERSET@telephones. They can be pulse dialing or DTMF sets, depending
on which types of dialing the CO trunks accept.
Page 
47 
						

							SECTION MITL9109-094-125-NAOperation
21.08 Power Fail Transfer occurs under any of the following con-
ditions:
0failure of the commercial AC power supply
loperation of the force transfer switch
lfailure of the -28 V power supply to the Main Control Card
lloss of sanity (malfunction) in the Main Control Card.
21.09 Normal operation is restored when the condition that caused it
isrectified:power is restored,controller sanity is re-
established, transfer switch is set to Normal.
21.10 If a call is in progress under system fail operation, the transfer
to normal operation for that circuit is delayed until the call is
completed (CO trunk on-hook for at least 1.8 seconds). This prevents
the call from being dropped during return to normal operation.
21.11Power Fail Transfer Plug and Jack Connections
Page 48CircuitRingTip
PinColourPinColour
TRUNK 126W-BL
1BL-W
TRUNK 227w-o2o-w
TRUNK 328W-G
3G-W
TRUNK 429W-BR4BR-W
TRUNK 530w-s
5s-w
TRUNK 6
31R-BL6BL-R
TRUNK CARD
132R-O7O-R
TRUNK CARD
233R-G8G-R
TRUNK CARD
334R-BR9BR-R
TRUNK CARD
435R-S10S-R
TRUNK CARD
536BK-BL11BL-BK
TRUNK CARD
637BK-0120-BK
Empty38BK-G13G-BK
LINE CARD 139BK-BR
14BR-BK
LINE CARD 240BK-S
15S-BK
LINE CARD 3
41Y-BL16BL-Y
LINE CARD 442Y-O
17O-Y
LINE CARD 543Y-G
18G-Y
LINE CARD 644Y-BR
19BR-Y
PHONE 145Y-S20S-Y
PHONE 246V-BL
21BL-V
PHONE 347v-o22o-v
PHONE 448V-G23G-V
PHONE 549V-BR24BR-V
PHONE 650v-s25s-v 
						

							Circuit Card Descriptions-----0u-----IIIa-..- . . . .._...0
0
OPTIONAL 
LWGS CONVERSION MODULE FOR PFT CARD
Figure 21-1 Power Fail Transfer Card
Page 49