Use and Types of the Modem.

Q3. What is the use of the modem? Define different types of modems.

Ans. A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines.                                                                                                                                             

Modems can be of several types:

1. Asynchronous Modems
2. Synchronous Modems

1. Asynchronous Modem

• Asynchronous modems can handle data bytes with start and stop bits.
• There is no separate timing signal or clock between the modem and the DTE.
• The internal timing pulses are synchronized repeatedly to the leading edge of the start pulse .

2. Synchronous Modem

• Synchronous modems can handle a continuous stream of data bits but requires a clock signal.
• The data bits are always synchronized to the clock signal.
• There are separate clocks for the data bits being transmitted and received.
• For synchronous transmission of data bits, the DTE can use its internal clock and supply the same to the modem.