index :
index
Basic information: :
Basic information: The word telephone comes from two Greek words, tele, meaning "distant," and phone, meaning "sound.“
It means transmission of sound carrying signals to certain far of distance.
History of telephone: :
History of telephone:
Operation of telephone: :
Operation of telephone: Mode of operation of telephone is full duplex.
It means we can transmit and receive in both the direction.
Main components of telephone:
Transmitter(Microphone).
Twisted pair cables, and
Receiver (Speaker)
Note: why we choosing the twisted pair cable’s.
What is meant by dialing in phone: :
What is meant by dialing in phone: It is not only meaning of dialing keypad or pushbuttons as dialing.
It is wide process undergone behind the dialing.
Converting of dialing numbers into pulses with difference frequencies is also called as Dual –Tone Multi-Frequency Signal(DTMF).
AT&Ts Compatibility Bulletin No. 105 described the product as "a method for pushbutton signaling from customer stations using the voice transmission path."