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

What is an amplifier, Q. What is an amplifier? What are the various types o...

Q. What is an amplifier? What are the various types of amplifiers? AMPLIFIER: A circuit that increases the amplitude of the given input signal is an amplifier. A small a.c. sig

Compute the received carrier frequency, Consider a transmitter S which radi...

Consider a transmitter S which radiates a sinusoidal carrier frequency of 1850 MHz. For a vehicle moving at 26.82 m/s, compute the received carrier frequency if the vehicle is movi

Explain index mode and base address mode, Explain index mode and base addre...

Explain index mode and base address mode (with examples) available in microprocessors. Index Mode and Base Address Mode: Address supplied through the instruction is adde

Revision of basics, Revision  of Basics Although  it is  assumed in th...

Revision  of Basics Although  it is  assumed in this book  that the  reader has  enough  knowledge of  various number systems ( binary, octal and hexadecimal and their relation

Network reconductoring - technical loss reduction, Network Reconductoring -...

Network Reconductoring - Technical Loss Reduction The size of conductor/cable is a significant parameter as it determines the current density and the resistance of the line. A

Find the efficiency of the transformer, Q. Athree-phase, 600-kVA, 2300:230-...

Q. Athree-phase, 600-kVA, 2300:230-V,Y-Ytrans- former bank has an iron loss of 4400 W and a full- load copper loss of 7600 W. Find the efficiency of the transformer for 70% full lo

Fast recovery diodes - types of power diodes , Fast  Recovery diodes ...

Fast  Recovery diodes The fast  recovery  diodes low recovery times. These diodes  are manufactured by diffusion. They are used in converter circuits where  the speed  of reco

For carry flag - conditional jumps , For carry Flag JC (  jump on  Ca...

For carry Flag JC (  jump on  Carry ) and JNC (Jump  on No carry ) Instructions : JC transfer the  execution of the  program to the  specified memory  address if  carry

Calculate the current flow using norton theorem, Calculate the current flo...

Calculate the current flow in 30Ω resistor for the circuit in figure using Norton Theorem.

Give an example of one address microprocessor, 8085 is a one address microp...

8085 is a one address microprocessor. In 8085 interrupts are classified by hardware and software interupts.

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