In this article, we will discuss what is modem in networking? How does modem work? and also discuss the basic history of the modem device.
A modem is a network hardware device that helps to convert signals from one computer network to another. It is used to connect the computer to the internet where it converts data signals into digital and analog form.
Modem establishes and maintains a dedicated connection to your internet service provider (ISP) to give access to the internet.
It works as a signal translator because it translates one signal to another signal so the computers and telephone lines can interact with each other.
A computer cannot communicate directly with your ISP phone lines because both the computer and the internet are works on different signal types that’s why we use a modem, which is used as a translator between your computer and the internet.
How Modem Works?
This term modem comes from Modulator and Demodulator
MO + DEM = Modulator, Demodulator
A computer or a machine can only understand digital signals (1’s and 0’s), but the telephone lines can only transmit data in analog form, so to convert the signals from digital to analog and analog to digital, we used a device called modem which comes from the term modulator and demodulator.
So a modem can modulate the signals and also demodulate the signals.
Modulate means to convert computer’s digital data signals into analog data signals so the data can travel on the internet.
Demodulate means to convert analog data signals from the internet into digital data signals so a computer can understand it.
Basic History of the Modem
According to Wikipedia,
In 1958, the telephone line modems were used in the US for the air-defense system as a part of SAGE (Semi-Automatic Ground Environment). Their purpose was to connect various airbases, radar sites, and command centers with SAGE director centers, to expand throughout the USA and Canada.
In 1959, the first modem (called Bell 101 dataset/modem) was commercially released by AT&T Corporation, which data speed around 110 bit/s.
In 1962, the second commercial modem (called Bell 103 dataset/modem) released by AT&T Corporation, which provides full-duplex data transmission at the speed of around 300 bit/s.
In 1977, the world’s first PC modem (called Hayes 80-103A) was created by Dale Heatherington and Dennis Hayes. At that time this modem was very popular in the US because of its ability, which allowed a direct connection to the phone at the right price.
In 1996, the technology of 56k modem was invented by Dr. Brent Townshend.
In 1998, the first 56k modem was commercially released in the market at a reasonable price.
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