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

Find the diameter of a circular waveguide, Q Find the diameter of a circula...

Q Find the diameter of a circular waveguide that will have a lower cutoff frequency of 10 GHz and also specify its largest usable frequency.

Nand gate - introduction to microprocessors , NAND Gate NAND   means NO...

NAND Gate NAND   means NOT AND  it complements  the output  of an AND  gate. The symbol  of NAND  by a NOT  gate.  Generally Not  operation  is represented by a bubble as shown

Motor control , Normal 0 false false false EN-IN X-NO...

Normal 0 false false false EN-IN X-NONE X-NONE MOTOR CONTROL

Energy conservation , Energy conservation: NEP envisages a voluntary a...

Energy conservation: NEP envisages a voluntary approach initially for promoting energy conservation along with emphasis on labelling of appliances. Gradually as awareness incr

Dc machines, what is working of dc machines?

what is working of dc machines?

Explain electrical contact materials, Explain electrical contact materials....

Explain electrical contact materials. Electrical contact materials: some elements, in their relatively pure forms as copper, nickel, molybdenum, palladium, silver, tungsten and

Central energy conservation fund, Central Energy Conservation Fund Thi...

Central Energy Conservation Fund This fund is to be set up at the Centre to develop the delivery mechanism for large-scale adoption of energy efficiency services like as perfo

Example of binary subtraction - positive number , Example  of binary  sub...

Example  of binary  subtraction - positive number Case 1.   Positive  number is more than negative number ( i e, answer is positive)   Example   subtract  4510 ( 1011012

Calculate sending-end voltage at 0.9 pf lagging, A three-phase, 34.5-kV, 60...

A three-phase, 34.5-kV, 60-Hz, 40-km transmission line has a per-phase series impedance of 0.2+j0.5/km. The load at the receiving end absorbs 10 MVA at 33 kV. Calculate the follow

Use of a k map simplify the following boolean expressions, Q. With the use ...

Q. With the use of a K map, simplify the following Boolean expressions and draw the logic diagram.

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