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...

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...

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...

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...

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...

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...

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...

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....

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...

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...