Illustrate about crossbar exchange, Electrical Engineering

Assignment Help:

Q. Explain crossbar exchange, with all call processing steps and diagrams.

Ans:

The basic concept of crossbar switching is to provide a matrix of n x m sets of contacts with only n + m activators or less to select one of the n x m sets of contacts. This form of switching is also called coordinate switching as switching contacts are arranged in a x-y-plane. A diagrammatic representation of a cross point switching matrix is displayed in Figure. There is an array of vertical and horizontal wires displayed by solid lines. A set of vertical and horizontal contact points are connected to these wires. Contact points form pairs, each pair comprising a bank of three or four horizontal and a corresponding bank of vertical contact points. A contact point pair acts just like a cross point switch and remains separated or open when not in use. Contact points are mechanically mounted (and electrically insulated) on a set of vertical and horizontal bars displayed as dotted lines. The bars, in turn, are attached to a set of electromagnets.

1207_Illustrate about crossbar exchange.png

When an electromagnetic energized, bar attached to it slightly rotates in such a way  that  contact  points attached  to  bar move  closer  to  its  facing contact points  but  don't  actually  make  any  contact.  Now  if an  electromagnet  in  the vertical  direction  is  energized,  corresponding  bar  rotates  causing  the  contact points at the intersection of the two bars to close. This happens as the contact point's move towards each other. For example if electromagnets M2 and M3' are energized, a contact is established at cross point 6 such that subscriber B is connected to the subscriber C.


Related Discussions:- Illustrate about crossbar exchange

What are difference equations, What are Difference Equations? A continu...

What are Difference Equations? A continuous-time system can be described by differential equations. Likewise, a discrete-time system can be explained by difference equations. T

What are the different types of patrolling, Q. What are the different types...

Q. What are the different types of Patrolling? When these are adopted? What are points to be considered while preparing the charts? Ans.- Types of Patrolling. 1. Keyman's

ELECTRO MAGNETIC INDUCTION, If aluminium and copper pipes are of same lengt...

If aluminium and copper pipes are of same length and diameter ... same magnet dropped through them...in copper it takes more time to come out of other end, i myself have done this.

Static v- i characteristics - power semiconductor devices , Static V- I Cha...

Static V- I Characteristics A thyristor  works in  three basic  modes a.Reverse  blocking mode b.Forwards  blocking  mode and c.Forward  conducting  mode In revers

What do you mean by amplifier block, Q. What do you mean by Amplifier block...

Q. What do you mean by Amplifier block? An amplifier can be modeled as a two-port device, that is, a box with two pairs of terminals designated as input and output, as shown in

Incorrect Solution, Hi there i just asked for question and answer for 5 cha...

Hi there i just asked for question and answer for 5 chapter and i just receive some of them in word the rest are in apiece of paper which is unprofessional could you please have l

What do you know about input impedance, Q. What do you know about Input Imp...

Q. What do you know about Input Impedance? Input Impedance  : Amplifiers will be quoted as having a specific input impedance. The sort of load it will place on preceding equipm

Dc machiunes, 1,Operation of face plate starter 2;Operation of a shaded pol...

1,Operation of face plate starter 2;Operation of a shaded pole motor 3,3 explained demerits of a rheostat method of starting adc machines

Newtons law of gravitation, Particles of mass M and m separated in space by...

Particles of mass M and m separated in space by a distance R exert a mutually attractive gravitational force F on one another given by where G is the universal gravitationa

Physical operation of the junction of diode, Q. Physical operation of the j...

Q. Physical operation of the junction of diode? The physical operation of the junction can be described in terms of the charge-flow processes. Usually there is a greater concen

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