TELEPHONE EXCHANGE

                                                                  ABSTRACT

The project is all about building a model TEELEPHONE EXCHANGE that facilitates the connection of eight(8) telephones. Telephone exchange switches one telephone connecting to other. Infact it is not the only thing it does, but the set with which communication  required is generating  the  pulses when the relevant number is dialed. The important functions of  telephone exchange are:

1) To Decode and process the pulses generated by the telephone sets

2) To generate a dialing tone

3) To generate and pass on a ringing tone

4) To interconnect the sets as soon as the receiver is lifted

5) To prevent the third party/ set listening in;

 The exchange is provided with LEDs that show at all times which of the sets, if any, are engaged. An indicating LED indicates whether the exchange is engaged or not. This LED goes out only when the communication has been terminated i.e. , when the two relevant receivers have been replaced on their rests. All the telephone sets are powered from a common source via the stand by and speech lines; The connection between each of the sets and the exchange is therefore, in many cases is possible, via two lines only. The bell voltage is placed on the speech line via a relay. Calling one set from another is done by simply dialing or keying in the number of wanted set i.e., 1…8 

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authors:

Y.VAMSI (Btech RVR&JC COLLEGE OF ENGG.)

N.PRAPOORNA  (Btech RVR&JC COLLEGE OF ENGG.)

R.BHUSHANAM (Btech RVR&JC COLLEGE OF ENGG.)

I sincerely thank authors,the students of "RVR&JC COLLEGE OF ENGG"

for their great support.

my special thanks to v.v.m.m.rao 

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