The Assignment demonstrates how the Signalling system between Switch Centres
continues to operate in spite of the possibility of error in transmission.
The Error Control Practicals are:
Error Control Structure
Call Progress Assignment
This shows the complete system records for actual successful or unsuccessful
The Call Progress Practicals are:
Call Set Up
In large telephone systems the computer system must be a
The Assignment shows how time slots are switched on to a Trunk Bus for
connections between the 2 Switching Centres.
The Trunk Switching practicals are:
The local Inlet and Outlet Busses are connecte
Trunk Call Progress Assignment
The Assignment shows the independent Call Records for each separate process
identified by the CSTDs.
The Trunk Call Progress Practicals are:
Signal Exchange Diagrams
A useful me
The Assignment uses the Transaction Capability Applications Part (TCAP) of SS7 to
organise the testing of a remote link in the system.
Manual operation of test procedures is also provided.
The System Testing Practicals are:
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Manual Control Assignment
The student implements the Control Outputs at each stage of Call Progress.
The Manual Control Practical is:
Originally all telephone Calls were controlled by an operator. The operator
received the In
Digital Switch Control Assignment
The Assignment shows how the Data Memory can produce Digital Switching,
and how it is controlled by the Connection Memory.
The Switch Control Practicals are:
Control of Time Switch
Connection of Tones
Digital Switch Archi
Line Scan Assignment
The input of data about the state of each telephone is demonstrated.
The Line Scan Practicals:
There are four telephones connected to each Switching Centre Workboard. Each is
connected to a Subscri
This Assignment examines methods of testing the telephone system, which could
be applied automatically.
The Testing Practicals are:
Telephone systems in operation need to be tested regularly to ensure correct
Line Records Assignment
This Assignment examines the Records relevant to each telephone line.
The Line Records Practicals are:
This Assignment examines the Line Records which are related to each line into the
Local Signalling Assignment
This Assignment introduces the normal operation of the Workboard system, the
use of signalling between the telephone and the switching centre.
The Local Signalling Practicals are:
The collection of data for assessing system usage is demonstrated.
The Traffic Practical is:
Telephone traffic is a measure of how much use is made of a particular telephone
system, or even part of a sys
State Transitions Assignment
This examines the elements in a Call State Transition Diagram which may occur
during a Transition from one State to another.
The State Transitions Practicals are:
Call State Transition Diagrams
The Call St
The arrangement of the system for trunk transmission is defined and set up.
The Trunk Configuration Practicals are:
Tones and Cadences
Digital Switch Allocation
The digital switch used for each Workboard has 8 Inl
Digital Switch Principles Assignment
This Assignment introduces the switching process required for digital speech
The Digital Switch Practicals are:
Time and Space Switching
Digital telephone signals use a
Transit Switching Centre Assignment
The Assignment shows the organisation required for Switching calls through Trunk
Network Switching Centres.
The Transit Switching Centre Practicals are:
Transit Switch CSTD
Call Records Assignment
The Assignment shows the stored information needed to control each telephone
The Call Records Assignments are:
A Call Record is an area of memory in which the essential data for