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...

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...

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...

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...

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...

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...

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...

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...

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...

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