Mitel SX 200 ML PABX Instructions Guide

							Circuit Card Descriptions 
SET FOR L,OOP START SET FOR GROUND START 
LEDs 
cc0113 
Figure 5-5 Loop Start/Ground Start Card and Jumper Settings 
ONS Line Card 
WARNING: ANY CONNECTION OF THIS CARD TO AN OFF PREMISE APPLICATION, 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. 
Brief Description 
5.7 The On-Premises (ONS) Line Card, part number 9109-010-00X, interfaces standard 
subscriber telephone sets to a PABX in the same building. It contains 12 line circuits 
and plugs into any slot. The card is 158 mm high x 368 mm long (6.2 in. x 14.5 in.). 
There are 13 LEDs on the front face of the card. The top 12 are each connected to a 
line circuit and light up to show that the circuit is in use. The LED at the bottom of the 
panel flashes to indicate an alarm (failure) condition. 
One ML-only ONS line card, part number 9109-01 O-003-NA, is shipped with each 
SX-200 ML PABX. Only one is allowed per PABX; additional ONS cards must be part 
number 9109-Ol O-OOO-SA. 
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1997 
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							Engineering Information 
Facilities 
Each line circuit provides the following facilities: 
l Line protection 
l Analog-to-Digital / Digital-to-Analog conversion (u-law) 
l Line circuit status monitoring 
l Signaling (ringing, message waiting). 
Electrical Description 
The following description applies to each line circuit. 
Tip and Ring are each protected against transients by a 200 volt varistor to ground. A 
bridge rectifier provides four protection diodes for the line circuit transistors. The -28 
volt line is protected by a 35 volt transorb. 
The line circuit performs 2-wire to 4-wire conversion, splitting the signal on the line into 
outgoing and incoming speech paths. The analog signal coming from the telephone 
is converted to pulse code modulation (PCM); the signal to be sent to the telephone 
is converted from PCM to analog audio. These conversions are performed by a Mite1 
Codec chip. 
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. 
The ONS Line Card supports the Message Waiting feature. A high voltage (-140 Vdc) 
is applied to the Ring terminal of the line to light a neon lamp on the subscriber’s set. 
Operation 
When a telephone goes off-hook, the line circuit detects the flow of loop current and 
signals the main processor. The processor responds by connecting a DTMF receiver 
to the line and sending 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. 
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. 
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. 
OPS Line Card 
Brief Description 
5.8 The OPS Line Card, part number 9109-040-000, contains six off-premises line cir- 
cuits. An Off-Premises (OPS) line circuit is used where the line goes outside the 
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							Circuit Card Descriptions 
building that houses the PABX and the line may be exposed to extraneous high volt- 
ages or induced currents (e.g., lightning). 
The OPS Line Card can be used in any digital high-power (upper) slot. The maximum 
number of these cards is four per bay, providing a maximum of 24 ports per bay. The 
card is 157.5 mm high x 366.4 mm long (6.2 in. x 14.4 in.). 
Major Components 
Major components for the OPS Line Card are: 
l Mite1 8962 FilterKodec (six) 
l 2-wire / 4-wire converter (six) 
l Ringing relay (one per circuit) 
l Alarm LED. 
Facilities 
Each line circuit provides the following facilities: 
l Line activity LED 
l Line protection 
l Analog-to-Digital / Digital-to-Analog conversion (p-law) 
l Signaling (ringing). 
Operation 
Each circuit has a LED on the front panel which lights to indicate that the line is in use. 
A seventh LED at the bottom of the panel 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 responds with dial tone. Dialing may be DTMF or pulses. Dial pulses 
are debounced by software to assure reliable performance. 
When a call is directed to the set, a relay closes and sends 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 
Line protection comprises high voltage varistors to energy dump ground from Tip and 
Ring plus fusible links incorporated into the battery feed resistors. EMI is controlled by 
inductors in series with Tip and Ring. 
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. 
The card circuitry performs 2-wire to 4-wire conversion that splits 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. 
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							Engineering Information 
The line circuit applies ringing voltage to the appropriate line through a relay and 
removes it when the telephone is answered. Answer is detected by monitoring the loop 
current. 
Loop current is provided through a pair of 200 ohm resistors. Below 900 ohms loop 
resistance, active current limiting circuitry limits line power to less than 1.5 watts. 
Ringing for each line is controlled by relay 2. 
Condition 
I Relay 1 Relay 2 
Idle 
or Talk 
I OFF 
I OFF 
I 
Ringing OFF ON 
Digital Line Card 
WARNING: ANY CONNECTION OF THIS CARD TO AN OFF PREMISE APPLICATION, 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. 
Brief Description 
5.9 The Digital Line Card (DLC), part number 9109-012-00X, provides an interface from 
the PABX to the following: 
l DATASET 
l SUPERSET 401+TM 
l SUPERSET 41 OTM 
l SUPERSET 420TM 
l SUPERSET 430TM 
l PKM Module 
l DNIC Music-on-Hold/Paging Unit (DMP) 
l MILINKTM DATASETS 
l SUPERCONSOLE 1000TM Attendant Console (must connect to a DLC installed 
in an upper slot). 
The DLC contains 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. 
The card is 158 mm high x 368 mm long (6.2 in. x 14.5 in.). 
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. 
Two ML-only Digital line cards, part number 9109-012-002-NA, are shipped with each 
SX-200 ML PABX. Only two are allowed per PABX; additional DLC cards must be part 
number 9109-012-000-SA. 
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							Circuit Card Descriptions 
Facilities 
Each Digital Network Interface Circuit (DNIC) provides the following facilities: 
l Line protection 
l Full duplex simultaneous data and voice digital transmission over a single pair of 
wire 
. Line circuit status monitoring 
9 Signaling and HDLC protocol to its associated DATASET. 
Electrical Description 
Each Digital Network Interface Circuit (DNIC) connects one of the devices listed in 
paragraph 5.9 to the common circuitry on the DLC card (and then to the PABX). The 
common circuitry will be described first, followed by a description of one DNIC. 
Thecommon circuitry contains a High-level Data LinkController (HDLC) which controls 
the D channel communication between each DNIC and the Main Control Card II (MCC 
II) within the PABX. This data is passed over one-half of a link to the MCC II, The 61 
and B2 channels from the DNlCs are multiplexed onto one link between the DLC and 
the MCC Il. The common circuitry includes phase-lock loop circuitry to keep the DNlCs 
in synchronization with the system clock, as well as circuits which prevent the DLC 
from disrupting the backplane 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 is connected to a separate tip-ring pair. 
DNIC Description 
Each DNIC connects via its tip-ring pair to a proprietary telephone, a DNIC Mu- 
sic-on-Hold/Paging Unit, or a DATASET which also contains a DNIC. The DNlCs com- 
municate with each other over the twisted pair at 160 Kb/s (two 64 Kb/s Bi 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 DNlCs communicate data plus voice simultaneously in full duplex over the 
single twisted pair between them. The twisted pair also carries the power required by 
the SUPERCONSOLE 1000, SUPERSET 401+, SUPERSET 4 10, SUPERSET 420, 
or the SUPERSET 430 telephone from the DNIC on the DLC. The DATASET is pow- 
ered from a separate AC power supply. 
Operation 
The Digital Line Card communicates with a DNIC-equipped device using digital trans- 
mission techniques: a voice channel, a data channel, and a control channel. It allows 
simultaneous transmission of voice and data over a single twisted pair of wires. When 
the DLC is connected to SUPERSET 410, SUPERSET 420, or SUPERSET 430 tele- 
phones. Each telephone may be connected to a /IJ/L/NKData Module which can be 
connected to a personal computer or similar data device. The telephone’s voice oper- 
ation and the data device’s data operation can both function concurrently. 
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							Engineering Information 
Loop Length Specifications for Connections to a Digital Line Card 
The following rules for loop lengths between the Digital Line Card within the PABX and 
the SUR!3SE~telephones, or SU/?!!F?CO/VSO~~ 7000 Attendant Console must be 
followed for proper operation of the device: 
Maximum loop length (twisted pair) 24 or 26 AWG 
see Table 
Maximum length of quad cable (22 AWG) 
50 m (16Oft) 
Modular Line Cord 
3 m (loft) 
Telephone, Module, or 
Console 
I n n n I I 
I-l LI 24 or 26 AWG twisted LI 50 m maximum 22 L-l 3m 
pair cable (see Table) AWG quad Modular 
u 
maximum 
Peripheral Device Maximum Loop Length 
SUPERSET 401+ 
SUPERSET 4 10 
SUPERSET 420 
Without Bridge Tap With Bridge Tap 
1OOOm 1OOOm 
1OOOm 1OOOm 
1000 
m 1OOOm 
SUPERSET 430 
Dataset 1103 1000 
m 1000 m 
2000m 1OOOm 
Dataset 2103 
SUPERCONSOLE 1000 console 2000 m 1000 m 
1OOOm 1OOOm 
Tl Trunk Card 
Brief Description 
5.10 The Tl Trunk Card interfaces a single Tl trunk circuit to the PABX. The Tl protocol is 
used primarily in North America. 
5-18 
The Tl Trunk Card provides the following facilities: 
l Tl Clock - System Clock Phase Comparator 
l Bidirectional Tl to ST-BUS data rate and format conversion 
l Line Equalization. 
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							Circuit Card Descriptions 
General Description 
The Ti interface will transmit and receive 24 &bit voice/data channels on a 4-wire 
digital trunk that operates at I.544 Mb/s. The BCC performs all control functions. 
To provide signaling information on the Tl line, data bits are “stolen” from each channel 
to provide channel associated signaling. 
The Ti Trunk Card includes a phase comparator which, through the Tl Clock on the 
Main Control Card II, keeps the system clock in phase with the incoming frame rate 
clock. The comparator prevents data losses caused by clock rate differences. (Refer 
to Main Control Card II in this Section). Phase error is the difference between the clock 
rate received on the link and the clock rate generated within the system (if the Ti clock 
is being adjusted to the incoming clock rate). If the difference climbs by greater than 
I in a single reading then the next three readings are filtered out. If the fourth reading 
has climbed greater than 1 then the link is considered unstable. A maintenance log 
is generated and the link is no longer used as a network synchronization source. 
The system supports two Tl Trunk Cards (slots 5 and 6). 
One incoming Tl trunk is selected as the primary timing source; the system locks its 
PCM clock and all other Tl trunk cards in the system to this incoming data stream. 
On-site T-l termination equipment, the Channel Service Unit (CSU) is required. The 
Tl Trunk Card includes switches to set appropriate line equalization for cable lengths 
up to 200 meters (655 feet) from the CSU. 
An adaptor fitted to the backplane connector provides a 15-pin D-Sub connector for 
the Ti facility and a 25-pair connector to maintain access to the adjacent odd-numbered 
card slot. Only one Tl Trunk Card can be installed. 
Electrical Description 
In the transmit direction, the data from the system PCM link must be converted from 
the Mite1 ST-BUS format of 32 channels at 2.048 MBit/set to the Tl format of 24 
channels at 1.544 MBit/set. To match the number of data channels, the Tl card skips 
every fourth channel on the ST-BUS links. The Ti interface circuits retime the output 
data to 1.544 Mbits/set and add the framing bits. 
In the receive direction, the framing bits are iemoved, the data is retimed to 2.048 MBit/ 
set and the channels are mapped onto the system PCM link in the same manner as 
above, with every fourth channel left empty. 
The system runs a loopback test during power-up or reset. A relay is operated to loop 
the card’s transmit line back to its receive line, removing the transmit data from the 
output line. A 6db attenuation is automatically added to the signal during loopback, to 
simulate actual transmission. The card remains in loopback until the test is passed. 
The relative phase of the Ti and system clocks is determined as follows: An 8 KHz 
clock output derived from the incoming frame rate is divided by two. This 4KHz signal 
gates a counter, which counts the number of cycles of the system 2.048 MHz clock 
occurring during one cycle of the 4 KHz signal. This phase count is sampled every 100 
ms. The oscillator on the Tl Clock on the Main Control Card II is adjusted to keep the 
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							Engineering Information 
phase count value constant over a longer term (I 6 seconds). The Tl circuit data buffer 
accommodates short-term phase variation (jitter). 
Indicators 
If any of the data channels on the Ti link are active, the upper front panel LED lights, 
giving visual indication of channel activity. 
If the PABX is receiving a yellow alarm condition, the yellow (NO SYNC) LED lights. 
If transmitting a yellow alarm condition, and not receiving a yellow alarm condition, 
then the LED is off. 
The lower red LED is the card alarm. If the PABX generates or receives a yellow alarm 
condition on the Tl link, the ALARM LED flashes. 
Physical Description 
The card measures approximately 158 X 368 mm (6.2 in. X 14.5 in.). The switches 
used (SWI) to set up proper equalization on the Tl Trunk card must be set as follows. 
Lengths are for cable length, not loop length. 
Short Cable (under 150 feet) Sl only - Closed 
Medium Length Cable (I 50 to 450 feet S2, S3, S4 only - Closed 
Long Length Cable (450 to 655 feet) S5, S6, S7 only - Closed 
COV Line Card 
WARNING: ANY CONNECTION OF THIS CARD TO AN OFF PREMISE APPLICATION, 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. 
Brief General 
5.11 The COV Card, part number 9109-020-000, is installed in a digital peripheral bay to 
interface to voice mail systems that require a COV interface. 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. 
The COV Card can be mounted only in a high-power (upper) card slot of a digital bay. 
Major Components 
The major components of the COV Line Card are: 
l Subscriber line interface circuit (SLIC) - one per line 
l Backplane interface 
0 PCM Timer 
. 6402 UART 
l 8840 Modem 
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							Circuit Card Descriptions 
. Line protection circuits 
. Line status LEDs - one per line 
l Card status LED - one. 
Facilities 
Facilities provided by the COV Line Card include: 
l Amplitude Shift Keyed communication 
l Analog/Digital and Digital/Analog conversions (p-law) 
l Battery Feed to power telephones. 
Electrical Description 
Control information from the backplane is converted to a 32 kHz amplitude shift-keyed 
(ASK) data stream. The audio information is taken from the 2 Mb/s data link, converted 
to analog audio and combined with the control information for transmission to the 
telephone. Conversely, the audio and ASK data signals from the telephone are sepa- 
rated and converted. The ASK data is demodulated and sent to the bay processor. 
The audio is digitized and transmitted on the data link. 
There is only one UART and one modem on the card. The six lines are time-divi- 
sion-multiplexed to the communication circuit. Transmission and reception are simul- 
taneous, but the card receives data from the telephone to which it last transmitted. For 
example, if the card is transmitting to telephone 2, it is receiving from telephone ?. In 
the next time slot, it will transmit to telephone 3 and receive from telephone 2. 
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. 
The maximum loop lengths for COV circuits are: 
Wire Gauge (AWG) Max. Loop length 
26 1000 m (3300 ft) 
24 1500 m (5000 ft) 
22 2000 m (6600 ft) 
Music-on-Hold/Pager Unit 
5.12 The Music-on-Hold/Pager unit interfaces a standard SX-ZOO DNIC port to the follow- 
ing external equipment: 
l External music source for Music-on-Hold 
l External paging amplifier (with or without answerback capability) 
l Up to two night bells 
l An external alarm. 
The unit is powered by the SX-200 ML PABX and does not require a separate power 
source. A single 25-pair amphenol connects to the SX-ZOO ML PABX via the main 
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							Engineering Information 
distribution frame. A single LED indicator provides basic status information. The unit 
can be wail-mounted next to the SX-20CJ ML PABX. 
Each Music-on-Hold/Pager Unit supports asingle paging zone. If more than one paging 
zone is required, then additional Music-on-Hold/Pager Units can be added as required. 
STATUS LED 
INTERFACE CONNECTOR 
EEOZO3 
Figure 5-6 Music-on-Hold/Pager Unit 
LED indicator 
The LED indicates the following states: 
Table 5-l Music-on-Hold/Pager Unit LED Indicator 
Indication Status 
OFF No power from SX-200 ML DNIC circuit 
Flashing (2 Hz - On 250 ms, Loss of synchronization with SX-200 ML PABX, the MOH/ 
Off 250 ms.) Pager Unit may be faulty 
1 On Solid 1 MOH/Pager Unit is operating 
Winking (2 Hz - ON 50 ms, MOH/Pager Unit is operating and the paging amplifier is be- 
Off 1 sec.) ing accessed 
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