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

Explain aas instructions in 8086 family, Explain AAS instructions in 8086...

Explain AAS instructions in 8086 family with example and their effect on flag. AAS: it is stands for ASCII adjust after subtraction; this is used to adjust the AX register l

Determine angle between incident ray and reflected ray, Assume a ray of lig...

Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected

Determine the mechanism of generation of the voltage, (a) Identify the semi...

(a) Identify the semiconductor type in the above diagram. (b) Explain the mechanism of generation of the voltage V AB in the above diagram. (c) An experimental setup like th

Explain the purpose of the global descriptor table register, Explain the pu...

Explain the purpose of the global descriptor table register. The GDTR stand for global descriptor table register and IDTR stand for interrupt descriptor table register conta

Dtl and ttl logic circuits, Q. DTL AND TTL LOGIC CIRCUITs? Bipolar tran...

Q. DTL AND TTL LOGIC CIRCUITs? Bipolar transistorswere the first solid-state switching devices commonly used to implement digital logic circuits in the 1950s and 1960s. These c

Metering standards, Metering Standards Relevant standards on metering ...

Metering Standards Relevant standards on metering are given in Table. Table: Relevant Metering Standards  Standards Description

What is cascade, An arrangement of Windows so every window is neatly stacke...

An arrangement of Windows so every window is neatly stacked with only the title bar of every window is showing.

Discuss the function of instruction queue in 8086, Discuss the function of ...

Discuss the function of instruction queue in 8086? In 8086, a 6-byte instruction queue is presented at the Bus Interface Unit (BIU). It is used to pre fetch and store at the ma

Magnetic Bond Method:, how does the magnetic bond method work? Application ...

how does the magnetic bond method work? Application of the magnetic bong method & advantages and disadvantages of the magnetic bond method.

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