Explain difference between space and time division switching, Computer Engineering

Assignment Help:

Through two block diagrams explain the difference between Space division and time division switching.

Space and Time Switching:

Space Switches: Connections can be made in between outgoing and incoming PCM highways by a cross point matrix of the form demonstrated in figure. However, various channels of an incoming PCM frame may require to be switched by various cross points in order to reach various destinations. Therefore, the cross point is a two-input AND gate. One input is linked to the incoming PCM highway and another to a connection store which produce a pulse at the needed instant. A group of cross points gates can be implemented like an integrated circuit, for illustration using a multiplexer chip.

662_Space Switch.png

FIG - Space Switch.

Figure demonstrates a space switch with k incoming and m outgoing PCM highways, all carrying n channels. The connections store for every column of cross points is a memory along with an address location for every time-slot that stores the number of the cross points to be operated in which time slot. This number is written in the address by the controlling processor so as to setup the connection. The numbers are read out cyclically, into synchronism along with the incoming PCM frame. In every time slot, the number stored at the equivalent store address is read out and decoding logic converts it in a pulse or a single lead to function the relevant cross point.

Because a cross point can make a diverse connection in each of the n time-slots, this is corresponding to n cross points in a space division network. The total space switch is therefore equivalent to n separate k x m switches in a space division switching network.

Time Switches: The principle of a time switch is demonstrated in figure. This connects an incoming n channel PCM highway to an outgoing n channel PCM highway. As any incoming channel can be connected to one outgoing channel, this is corresponding to space division cross point matrix along with n incoming and n outgoing trunks, as demonstrated in figure. Time-slot interchange is carried out through two stores, each containing a storage address for each channel of the PCM frame. The speech store consists of each data of the incoming time-slots (that is its speech sample) at a matching address. All address of the connection store corresponds to a time slot upon the outgoing highway. This contains the number of the time-slot on the incoming highways that sample is to be transmitted in which outgoing time-slots. Information is read in the speech store cyclically in synchronism with the incoming PCM systems; however, random access read out is utilized .The connection store has cyclic read out, although writing in is non cyclic. To set up a connection, the number (X of the time-slot of an incoming channel is written in the connection store at the address equivalent to the selected outgoing channel (Y ).Throughout each cyclic scan of the speech store ,the incoming PCM sample from channel X is written in address X. Throughout each cyclic scan of the connection store, the number X is read out at the starting of time-slot Y. It is decoded to select address X of the speech store, which contents are read out and sent over the outgoing highway.

1971_Time Switch.png

FIG - Time Switch


Related Discussions:- Explain difference between space and time division switching

Explain moores law and amdahls law, Question (a) Imagine you need to mo...

Question (a) Imagine you need to move people through a distance of 10 miles, with the following specifications. • Car: capacity = 5, speed = 60 miles/hour • Bus: capacity

How can common bus system be constructed, How can common bus system be cons...

How can common bus system be constructed A common bus system could be constructed using multiplexers. These multiplexers select source register whose binary information is then

Determine no.of processes to avoid race condition, To avoid race condition,...

To avoid race condition, the maximum number of processes that may be simultaneously inside the critical section is The maximum number of processes is one to ignore race conditi

State the example of begin end, State the Example of begin end module s...

State the Example of begin end module sequential(); reg a; initial begin $monitor ("‰g a = ‰b", $time, a); #10 a = 0; #11 a = 1; #12 a = 0; #13 a = 1; #

What is micro programmed control, What is micro programmed control? Mic...

What is micro programmed control? Micro programmed control is a scheme in which control signals are formed by a program same to machine language program.

What is charge-coupled devices, Q. What is Charge-coupled Devices? CCDs...

Q. What is Charge-coupled Devices? CCDs are employed for storing information. They have arrays of cells that can hold charge packets of electron. A word is signified by a set o

What is read-only-memory, Q. What is Read-only-Memory? Read only memory...

Q. What is Read-only-Memory? Read only memory is an illustration of a Programmable Logic Device (PLD) it implies that binary information which is stored within a PLD is specifi

What functions connect( )& accept( ) call in socket interfac, What function...

What functions connect( ) and accept ( ) call in Socket interfacing? connect() system call: Clients use procedures connect to initiate connection with an exact server. The

Illustrate working of rubber dome keyboards, Q. Illustrate working of rubbe...

Q. Illustrate working of rubber dome keyboards? Rubber Dome: In rubber dome keyboards both positioning and contact are controlled by a puckered sheet of elastomer that is a s

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