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 is meant by doping, What is meant by doping? How does it affect a semi...

What is meant by doping? How does it affect a semiconductor? Doping: The process through which an impurity is added to semiconductor is termed as doping. A semiconductor to th

Ic packaging, which type of ic package is more advantageous,suitable and ve...

which type of ic package is more advantageous,suitable and versatile

Which alloy is used for making heater & thermocouple element, Give the name...

Give the names of four alloys along with their composition, which are used for making heater and thermocouple elements. Constantan or Eureka {(55 to 60 percent) Cu, (45 to 40 p

Differences between vga and cga graphics adapters, Q.9 What are the main...

Q.9 What are the main differences between VGA and CGA graphics adapters? Ans: Colour Graphics Adapter (CGA), initially also known as Colour/Graphics Adapter or IBM Colo

Gto - gate turn off, GTO ( Gate Turn Off) GTO stands for gate  turn o...

GTO ( Gate Turn Off) GTO stands for gate  turn off  thyristor . it is four layer  PNPN  device. It can be  triggered into conduction like a conventional thyristor  by a pulse

Give a brief description of integrating circuits, Q. Give a brief descripti...

Q. Give a brief description of integrating circuits ? Integration is a summation of area. An integrating circuit produces an output voltage which is proportional to the area en

Why memory decoding is required, Why memory decoding is required? To a...

Why memory decoding is required? To attach a memory device to the microprocessor, this is necessary to decode the address sent by the microprocessor. Decoding creates the memo

How time slot interchange, Q. How time slot interchange switch works in tim...

Q. How time slot interchange switch works in time multiplexed time switching, Elucidate using schematic. Ans: Switches for which inlets and outlets are trunks that carry tim

Determine efficiency and form factor, Q Consider a three-phase, full-wave b...

Q Consider a three-phase, full-wave bridge recti?er, as shown in Figure, with a purely resistive load R. For each diode, determine: (i) efficiency, (ii) form factor, (iii) ripple f

Electronics, why bypass capacitor is used

why bypass capacitor is used

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