Mitel SX 200 ML PABX Instructions Guide

							Circuit Card Descriptions 
Interface Technical Specifications 
MOH Input 
The MOH input is a transformer-coupled input with impedance of 600 ohms. The gain 
is fixed at -4 dB A/D. In order to meet signal power limits applied to such interfaces by 
FCC part 68 and Industry Canada, CS03. The audio level at the digital point will be 
limited to -15 dBm0 and the frequency response is rolled off (3 dB point) at approxi- 
mately 3 Khz. The amplitude limiting begins to affect the input signal when it exceeds 
approximately 100 mVrms; therefore, input signals should be in the range of 10 to 100 
mVrms. 
Paging InpuVOutput 
The paging interface is a transformer-coupled loop start trunk with an impedance of 
600 ohms. The DC termination is activated by a relay when the paging amplifier is 
being accessed. The gain is fixed at -4 dB A/D and +3 dB D/A. 
When used with an “answer bacY paging amplifier, this interface must meet signal 
power limits applied to such interfaces by FCC part 68 and Industry Canada CS03. 
The audio level at the digital point will be limited to -15 dBm0 and the frequency 
response is rolled off (3 dB point) at approximately 3 Khz. The amplitude limiting begins 
to affect the input signal when it exceeds approximately 100 mVrms; therefore, an- 
swerback signals should be in the range of IO to 100 mVrms. 
Relays 
Relays are provided for Paging, Night Bells, and Alarms. The contacts are rated at 
0.1 A at 90 Vat or 0.5 A at 48 Vdc. 
Paging Control Relay. Both normally open and normally closed contacts are provided 
to control the external paging amplifier. These relay contacts are switched whenever 
the paging amplifier is being accessed. 
F 0 
Night Bell Relays. Two independent, normally open relays are provided to control 
external night bells. 
Alarm Relay. One normally open relay is provided to control external devices such as ii 
an alarm. 
1 
= 
3 
2 
z 
i3 
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							6 Signaling and 
Supervision 
General 
6.1 This Part outlines the signaling and supervision parameters of the PABX. 
The standard range of tones are available from the PABX’s Digital Signal Processor: 
. 12 DTMF sets of tones, as listed in Table 6-l. 
l A set of call progress tones as listed in Part 9, which form part of the country’s 
Audible Tone Plan. 
l One ringing tone of 20 Hz. 
The PABX is capable of accepting and repeating signals from telephone sets which 
have the parameters shown in Table 6-1, DTMF Tone Parameters and Table 6-2, Dial 
Pulse Reception Limits. 
Where any of the frequencies shown in Part 9 are present at the system input, any 
other single frequency (200 - 3400 Hz) should be a minimum of 40 dB below the signal 
frequency. DTMF pulses are registered in the presence of precise dial tone at a level 
of -10 dBm. 
The PABX gives the following output signal conditions: 
l Dial Pulse Conditions: 
Pulse Rate :9to 11 pps 
Break Interval : 58% to 62% 
Interdigit Time : 800 ms. 
l DTMF Dialing Conditions for North America: 
Frequency Deviation : k I % 
Tone Duration : greater than 90 ms 
Interdigit Time : greater than 100 ms 
Level, low group : greater than -4 dBm 
Level, high group : greater than - 4 dBm 
Level, DTMF signal : less than -1 dBm 
Level, third Harmonic: better than 40 dB Frequency below DTMF signal 
Twist :0 dB. 
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Table 6-l DTMF Tone Parameters 
High Frequency (Hz) 
Low Frequency (Hz) 1209 1336 1477 
697 I 2 3 
770 
4 5 6 
852 7 8 9 
941 * 
0 # 
I 
Frequency deviation: IL 1.5 % 
Signal interval (2 frequency): 
40 ms (min) 
Per frequency, minimum level: -17 dBm on line circuit 
Twist, maximum (at -10 dBm): +4 to -8 dB (high frequency relative to low frequency) 
Table 6-2 Dial Pulse Reception Limits 
Parameter 
ONS Line: Min Max 
I Pulse Rate 
I t3 PPS 1 12 PPS 1 
Break Duration 1 1 
58% 64% 
Interdigit Time 
Pulse Rate OPS Line: 300 ms 
8 PPS 15s 
12 PPs 
Break Duration 
Interdigit Time 42% 84% 
300 ms 15s 
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							7 Transmission 
General 
7.1 
The following descriptions detail some of the transmission characteristics which apply 
to the PABX. 
Frequency Response 
7.2 The frequency response relative to 1004 Hz at 0 dBm for different types of intercon- 
nections is shown in Table 7-l. 
Table 7-l Frequency Response 
Variation in Attenuation with 
respect to 1004 Hz (dB) 
Interconnection Frequency (Hz) minimum maximum 
Line to Line 
60 -20.0 -- 
or 200 0 
-5.0 
Line to 2-W Analog Trunk 
300 0.5 -1 .o 
or 
3000 0.5 -1 .o 
2-W Analog Trunk to 2-W 3200 0.5 -1.5 
Analog Trunk 3400 0 -3.0 
Line to 4-W Analog Trunk 
60 -20.0 -- 
or 200 0 -4.0 
2-W Analog Trunk to 4-W Analog Trunk 300 0.4 -0.65 
3000 0.4 -0.65 
3200 0.4 -1.5 
3400 0 
-3.0 
4-W Analog Trunk to 4-W Analog Trunk 60 -16.0 
-- 
200 0 -3.0 
300 0.3 
-0.3 
3000 0.3 -0.3 
3200 0.3 -1.5 
3400 0 
-3.0 
Overload - Digitally Switched Analog Card Types 
7.3 The overload levels shown in Table 7-2 define the maximum signal levels which may 
be applied to an analog interface before clipping occurs. The Input Overload (IOL) de- 
fines the maximum analog input signal level which can be applied to a digital interface 
circuit before clipping of the encoded PCM word occurs. The Output Overload (OOL) 
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defines the maximum analog output signal which can be produced at the output of an 
interface by the application of a 3 dBm0 digital signal to the input. 
Table 7-2 Overload Levels - Digitally Switched Analog Card Types 
I 7 Overload Point (dB) 
I 
I Interface Type 
I Connecting Circuit 
I IOL 
I OOL 
I 
ONS(A) any circuit 6.0 0 
ACO(A) ONS(D) 0 3.0 
ACO(A) any trunk 3.0 3.0 
Quantization Distortion 
7.4 The quantization distortion of a connection is a measure of the signal to distortion ra- 
tio as the input signal is varied. Note that this parameter does not apply to the analog 
card types. For 95% of connections the signal to distortion ratio will exceed the limits 
shown in Table 7-3. 
Table 7-3 Signal To Distortion Ratio 
I 1004 Hz Input Level (dBm0) 
I Signal/Distortion Ratio (dB) 95% of all connections 
I 
0 to -30 33 
-40 27 
22 
Intermodulation Distortion 
7.5 Intermodulation (harmonic) distortion is measured by using two pairs of equal level 
tones (851/863 Hz and 1372/l 388 Hz), at a total composite input power of -13.0 
dBm0. Table 7-4 shows the second and third order products for the different types of 
connections. For 95% of the connections in each category, intermodulation distortion 
will exceed the stated limits. 
Table 7-4 Intermodulation Requirements (4.8 KB/s) 
I Connection Type 1 Second Order Product (dB) 1 Third Order Product (dB) 1 
Line to Line 40 43 
Line to Trunk 45 53 
Trunk to Trunk 45 53 
Return Loss 
7.6 The ERL and SFRL return losses for different types of interconnection or idle states 
are shown in Table 7-5. 
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Table 7-5 Return Loss Characteristics 
Connection Type 
Line to Line 
Line to 4-W Trunk Terminal Through Transhybrid Non-T 
Balance Balance Loss aiking 
ERL SFRL ERL SFRL 200 - 500 - 
CcW 
Cd@ (W Cd@ (W 3400 2500 
Hz Hz 
18 12 
24 14 
Crosstalk 
7.7 The crosstalk attenuation, or coupling loss, between any two transmission paths at 
any frequency between 200 and 3200 Hz is greater than 75 dB for 95% of all 
connections. 
Echo Path Delay 
7.8 The round trip echo path delay with a frequency of 1500 Hz does not exceed the stat- 
ed values for the following types of interconnection: 
l Line to Line: 3.0 ms 
l Line to Trunk: 3.0 ms 
l Trunk to Trunk: 3.0 ms. 
Envelope Delay Distortion 
7.9 Table 7-6 details the maximum envelope delay distortion for the digital card types. 
These objectives are met by 95% of all connections. For the analog card types, the 
envelope delay distortion is less than 200 microseconds between 400 and 3200 Hz, 
for all connections. 
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Table 7-6 Envelope Delay Distortion 
Connection Type 
Frequency Band (Hz) 
Line to Line 1000 - 3000 
Envelope Delay Distortion (microseconds) 
less than 280 
400 - 3200 less than 560 
Line to Trunk 1000 
- 3000 less than 140 
I 400 - 3200 I less than 280 I 
Trunk to Trunk 1000 - 3000 less than 140 
400 - 3200 less than 280 
Longitudinal Balance 
7.10 All connections (except ONS) meet the longitudinal balance requirements outlined in 
Table 7-7. Note that these apply to OFF-HOOK circuits only. 
Table 7-7 Longitudinal Balance 
Frequency (Hz) 
200 
500 
1000 
3000 Longitudinal Balance (dB) 
Minimum Average 
58 63 
58 63 
58 63 
53 58 
System Impedances 
7.11 System impedances are as follows: 
l Station 
- 9109-010: 600 ohms input impedance 
600 ohms DC loop resistance. 
l LS/GS Trunk Loop: 
600 ohms input impedance, 1600 ohms loop range. 
l LS/GS Trunk T/R to ground Resistance - both in the IDLE state : 
- greater than 30 Kohms (ground start) 
- greater than 10 Mohms (loop start). 
l Analog type lines: 600 ohms ac input impedance, nominal 
l Analog type trunks: 
600/900 ohms ac input impedance, nominal 
Idle Channel Noise - C Message 
7.12 The idle channel C message noise will not exceed the following values for any type of 
interconnection: 
l Average: 16 dBrnC 
l 95% of all interconnections: 20 dBrnC 
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Idle Channel Noise - 3 kHz Flat 
7.13 The idle channel noise for 3 kHz flat noise requirements do not exceed the following 
values for any type of interconnection: 
l 95% of all interconnections: 39 dBrn0 
l 50% of all interconnections: 35 dBrn0 
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