Mitel Sx 50 Dpabx Instructions Guide

Engineering Information 
: 
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180 6-2 Revision 0 9104-091-l 80-NA Issue 5  

7 . 
TRUNK OPERATION 
LS/GS Trunk Card Operation - Loop Start 
7.1 To place an outgoing call, the trunk circuit places a termination across the Tip and 
Ring leads. The CO detects the current flow and responds with dial tone. The user 
can now dial digits. 
The trunk circuit recognizes an incoming call when it receives ringing voltage or battery 
reversal from the CO. The trunk circuit responds by placing a termination across the 
Tip and Ring leads. The system releases the trunk by breaking the loop...

Engineering Information 
Table 7-l E&M Trunk Module Switch Settings 
Function Switches 
12345678 
Signaling 
Type 1 
Type 5 
x x x x x 1. x x 
xxxxxoxx 
PABX to Line Gain 
3 dB 
-13 dB oxxxxxxx 
lxxxxxxx 
- ‘, 
Line to PABX Gain 
-4dB 
-11 dB xoxxxxxx 
xlxxxxxx 
Termination 
600 52 
Complex xx1 oxxxx 
xx01xxxx 
Transmission 
2-wire 
4-wire xxxxl xxx 
xxxxoxxx 
Note: 0 = Open, 1 = Closed, x = Not Applicable. 
DID Trunk Card Operation 
7.4 In the idle state the DID Trunk circuit applies a battery feed of...

- 8 
’ UNIVERSAL CARD MODULES - 
OPERATION 
RMATS Module Operation 
8.1 The UART converts the parallel data on the Universal Card data bus to the serial 
format required by the modem. The output of the modem is one of two audio tones, 
depending on the logic level at the input. A MITEL Codec converts this to the digital 
audio coding used within the SX-50 system. 
Signals coming from a remote terminal’s modem are first digitized by the ONS Line 
Card (or LS/GS Trunk Card) before routing to the RMATS...

Engineering Information 
180 8-2 Revision 0 9104-091-l 80-NA Issue 5  

_ 9 
’ DIGITAL SWITCHING MATRIX 
DESCRIPTION 
General 
9.1 The SX-50 system accepts analog voice signals at its line and trunk inputs, converts 
them into digital signals and passes them to the Digital Switching ,Matrix. The method 
. . ._ 
of conversion is Pulse Code Modulation (PCM). Tim+Drvrsron-Multiplexing (TDM) is 
used to combine many signals for transmission over a few single links within the 
system. The signal is routed via these links to its destination - usually a line card or a 
trunk card -...

Engineering Information 
A Link is divided into 32 channels, each assigned a time slot. Each channel, depending 
on its source; may carry PCM-encoded audio or control data. The information on each 
channel is provided in 8-bit binary samples (bytes), as previously discussed. Since the 
sampling rate is 8 kHz, on any given channel a new sample is encoded every 125 ps. 
During each 125 p.s period, the TDM circuitry transmits the most recent 8-bit sample 
from each of the 32 channels in turn. Each group of...

10 . 
TRAFFIC CONSIDERATIONS 
General 
10.1 This Part provides data used in determining traffic-dependent parameters. These 
parameters are: 
l Quantities of trunks installed. 
l Level of traffic per line. 
l Level of traffic per system 
Reference tables assist in estimating the SX-50 hardware requirements for a range of 
typical applications. Table 10-l is used to determine the station traffic characteristics 
of a business. Table 10-2 provides the maximum allowable station traffic for 
configurations...

Engineering Information 
Typical Station Traffic Characteristics 
10.3 The provisioning of an SX-50 system for a particular application depends upon the 
average station usage (traffic), as characterized by two parameters: 
l Traffic per station (Busy Hour, Busy Day) 
l Percent Trunk Traffic (versus intercom). 
The traffic per station depends upon how much the average job function in the business 
requires the use of a telephone. For example, a regional wholesale distributor may 
have a large group of...

Traffic Considerations 
Table 1 O-2 System Traffic 
Maximum System Traffic per Line (CCWLine) 
COV/DNIC* 0 8 16 
24 32* 40 48 56 
TRK 
ONS 
16 0 - 36.0 25.3 16.8 12.6 10.1 6.5 3.9 
16 16 25.3 16.8 12.6 10.1 8.4 5.9 3.9 2.3 
16 32 12.6 10.1 8.4 7.2 5.5 3.8 2.5 - 
16 48 8.4 7.2 6.3 5.1 3.7 2.6 - - 
16 64 6.3 5.6 4.7 3.6 2.6 - - - 
16 80 5.1 4.4 3.5 2.7 - - -  T 
16 96 4.2 3.4 2.7 _ _ -_ _ - 
16 112 3.3 2.7 - - _ _ _ - 
, 
16 128 2.6 
_ _ - _ _ - _ 
24 0 - 36.0 36.0 21.9 13.6 8.5 5.2 2.8 
24 16 31.7 22.3...