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

Determine the inductor current, Q. In a GLC parallel circuit excited by a c...

Q. In a GLC parallel circuit excited by a current source i(t), for G = 0.5S, L = 3H, and C = 0.5 F, determine i(t) if the inductor current iL(t) = 12e -0.5t .

Find load resistance and voltage, Q. Find load resistance and voltage? ...

Q. Find load resistance and voltage? Let the amplifier block be connected to a current source at the input terminals, as shown in Figure(a), and to a load resistance R L at it

Process of amplitude modulation, Q. Process of Amplitude Modulation? In...

Q. Process of Amplitude Modulation? In AM the message signal is impressed on the amplitude of the carrier signal. There are several different ways of amplitude modulating the c

Major advantages of fet transistors over bjt transistors, Q. What the major...

Q. What the major advantages FET transistors over BJT transistors? a. BJT transistor (bipolar junction transistor) is a bipolar device - the prefix bi-revealing that the conduc

Explain practical digital to analog converters, Explain Practical Digital t...

Explain Practical Digital to Analog Converters? In several DSP applications, we must reconstruct an analog signal after the digital processing stage. This is completed using a

Show bandwidth of the system, A communication system for a voice-band (3 kH...

A communication system for a voice-band (3 kHz) channel is designed for a received SNR E b /N 0 at the detector of 30 dB when the transmitter power is Ps =-3 dBW. Find the value o

Planning and research in power system, Q. Planning and Research in power sy...

Q. Planning and Research in power system? Energy research worldwide is assuming top priority, in particular because of economic, en - vironmental, and resource constraints. DOE

Crossmagnetisation, what is crossmagnetisation in dc generator

what is crossmagnetisation in dc generator

What is the function of gate signal in 8254 timer, What is the function of ...

What is the function of gate signal in 8254 timer? The  8254 has three independent 16-bit counters, which can be programmed to. Work in any one of possible six modes. Every cou

Determine the current in the circuit and the voltage, Q. Two identical junc...

Q. Two identical junction diodes whose volt-ampere relation is given by Equation in which I S = 0.1 µA, V T = 25 mV, and η = 2, are connected as shown in Figure. Determine the cu

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