Telephone Links
Category : JEE Main & Advanced
(1) Telephone is the most common means of communication. Now a days, the telephone system is required to converse from earth to another heavenly bodies like moon etc.
(2) A telephone link can be established with the help of co-axial cables, ground waves, sky waves, microwaves or optical fibre cables.
(3) Simultaneous transmission of a number of messages over a single channel without their interfering with one another is called multiplexing. Two types of multiplexing techniques are in use :
(i) Frequency division multiplexing uses analog modulation of message signals.
(ii) Time division multiplexing makes use of pulse modulation of message signals.
(4) Twisted pair wire lines provide a band width of 2 MHz, while co-axial cable provides a band width of 20 MHz. For further increase in band width, we use
(i) microwave link
(ii) communication satellite link.
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