What is a modem? | Modem and its types
What is a modem? | Modem and its types
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A modem is a gadget that is used to transmit digital data through an Analog system. The term is determined from”modulator-demodulator”. Modems are sorted based on two criteria:
The first is Data sent/unit time
And the second one is Change in the state of the signal/unit time
The first modem was used during the ’60s decade, to interface over a network of phone lines. It was 1977 when a modem was first used with a computer for transmitting data to another computer. The gadget is used for modulating an Analog transporter signal to carry digital data just as for demodulating a small signal so as for decoding the digital data from the Analog carrier signal. In this article, we will explore the types of modems
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What is the modem?
Modem
Modems are used to transmit digital information via analog systems. The word “Modem” is derived from the term “modulator-demodulator.” The fundamental elements of a modem are to modulate an analog carrier signal to carry digital data and to demodulate a comparable signal in order to disentangle the digital data from the analog carrier signal.
The modem stands for modulator and demodulator.
Modulator means that converts digital signals into analog signals and sends them over telephone lines.
This process is known as modulation.
Demodulator means that the receiving modem converts analog signals into digital signals and this process is known as demodulation.
It helps us to transmit data from one computer to another computer using standard telephone lines.
Transmission Rate:
Speed:
Self Testing
Voice over Data:
Error Control:
Types of modems
There are many types of modem.
. External Modem
. Internal Modem
. Wireless Modem
Fax modem
Dial-up modem
DSL modem
ISDN modems
Cable Modems:
ADSL Modems: