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

Wien bridge, How i prepare a wien bridge for my college assignemen?

How i prepare a wien bridge for my college assignemen?

Prepaid metering, Prepaid Metering Prepaid metering is the state of ar...

Prepaid Metering Prepaid metering is the state of art for single and three-phase although current metering, and should be implemented through utilities desirous of protecting

Short circuit, what is the time of short circuit ?

what is the time of short circuit ?

Purpose of control word written to control register in 8255, What is the pu...

What is the purpose of control word written to control register in 8255? The control words written to control register state an I/O function for every I.O port. The bit D7 of t

Software defined radio and modulation recognition, As we all know the next ...

As we all know the next century demand for wireless technology is expected to be the commercial implementation of Software Defined Radio (SDR) paradigm to improve base station effi

Ac supply, its defination and mathematical expression if any

its defination and mathematical expression if any

Vhdl, how to construct universal shift register using D-flipflop and mux??

how to construct universal shift register using D-flipflop and mux??

Static rotor resistance control methods - motor control , Static Rotor Res...

Static Rotor Resistance Control Methods This method is used only for slip  ring induction motor in SRIM  3- phase  variable  resistor can be inserted in the rotor  circuit and

Induction motor, principle and operation of 3phace induction motor

principle and operation of 3phace induction motor

Electrons and holes, E l e c t r ons and Holes For T> 0 K, t...

E l e c t r ons and Holes For T> 0 K, there would be some electrons in the otherwise empty conduction band, and some empty states in the otherwise filled valence ban

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