Common control switching system, Electrical Engineering

Assignment Help:

Q. Common control switching system?

Common Control Switching System: A functional block diagram of a common control switching system is displayed in Figure. Control functions in a switching system may be placed under four wide categories:

(a) Event monitoring.

(b) Call processing.

(c) Charging.

(d) Operation and maintenance

2077_Common control switching system.png

Events occurring outside exchange at the line units, trunk junctions and inter exchange signaling sender/receiver units are all monitored by control subsystem. Typical events include all requests and call release signals at the line units. Occurrences of events are signalled by operating relays that initiate control action. Control subsystem may operate relays in the junctions, receivers/senders and line units and hence command these units to perform certain functions. Events monitoring can be distributed. For illustration, line units themselves may initiate control actions on occurrence of certain line events. Whenever a subscriber goes off-hook, event is sensed, calling location is determined and market for dial tone and register finder is activated to seize a free register. Identity of calling line is used to determine line category and class of service to which the subscriber belongs. A register appropriate to line category is chosen, which then sends out dial tone to the subscriber, in readiness to receive dialing information. As soon as initial digits (usually 2-5) which identify exchange are received in register, register continues to receive remaining digits. Initial translator determines the route for call through the network and decides whether a call should be put through or not. It also determines charging methods and rates applicable to the subscriber. Initial translation can also take into account instructions from operating personnel and information regarding status of the network.


Related Discussions:- Common control switching system

Compare the merits and demerits of analog voltmeters, Question : (a)(1)...

Question : (a)(1) Show different types of voltmeters commonly used. (2) A basic d'Arsonval meter movement with an internal resistance Rm = 100 ?,and a full scale current of

Obtain expressions for the in-phase and quadrature component, Q. For DSB an...

Q. For DSB and conventional AM, obtain expressions for the in-phase and quadrature components x d (t) and x q (t), and envelope and phase v(t) and φ(t).

Kirchoff''s current law, Kirchoff's Current Law The total current ent...

Kirchoff's Current Law The total current entering a node in a circuit is equal to the total current leaving that node. A Node is a junction between two or more components.

Matlab, what is the future scope of matlab in india?

what is the future scope of matlab in india?

Practical properties of operational amplifiers, Q. Practical properties of ...

Q. Practical properties of operational amplifiers? To achieve voltage gain and consequently power gain, the op amp must be biased by a dc source. The biasing network is compris

Second Order Precesses, A second-order process with one pole at the origin ...

A second-order process with one pole at the origin has the transfer function 3/(s(2s + 1)) Find the output as a function of time, for a unit step input change. Sketch the expected

Customer satisfaction - issues of power supply, Customer Satisfaction - Iss...

Customer Satisfaction - Issues of Power Supply Customer satisfaction measurement is a systematic process for collecting customer data (e.g. surveys, audits and etc.), analyzin

SINGLE-PHASE INDUCTION MOTORS MOTORS, HOW DOES SINGLE PHASE INDUCTION MOTOR...

HOW DOES SINGLE PHASE INDUCTION MOTORS DEVELOP A STARTING TORQUE ?

Classify the different types of insulating materials, Classify the differen...

Classify the different types of insulating materials with reference to their limiting safe temperatures for use. On the basis of insulating materials and their limiting safe te

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd