What Is a Role of Modem in Computer Networking?

What Is a Modem (modulator-demodulator) And What Is Broadband And Dial-Up Modems?

A modem (modulator-demodulator) is a device that gave permission to a computer to send and receive data over a cable or telephone line or satellite connection. In the case of data transmission over an analog telephone line, which was once the popular way to access the internet, the modem converts data between analog and digital formats in real time for two-way network communication. In the case of the high-speed data transmission digital modems popular today, the signal is much simpler and does not require the analog-to-digital conversion.
What Is a Role of Modem in Computer Networking?

History of Modem (modulator-demodulator)

The first devices called modems converted digital data for transmission over analog telephone lines. The speed of these modems was historically measured in baud (a unit of measurement named after Emile Baudot), although as computer technology developed, these measures were converted into bps (bits per second). The first commercial modems supported the speed of 110 bps (bits per second) and were used by the U.S. Department of Defense, news services, and some large businesses or organizations.

Modems moderately became familiar to consumers in the late '70s through the '80s as public message boards and news services like CompuServe were built on early internet infrastructure. Then, with the explosion of the World Wide Web in the mid and late 1990s, dial-up modems emerged as the primary form of internet access in many households around the world.

Broadband Modem (modulator-demodulator)

A broadband modem like those used for DSL (Digital subscriber line) or cable internet access uses advanced signaling techniques to obtain dramatically higher network speeds than traditional dial-up modems. Broadband modems are usually referred to as high-speed modems. Cellular modems are a type of digital modem that establishes internet connectivity between a mobile device and a cell phone network.

External broadband modems plug into a home broadband router or other home gateway device on one end and the external internet interface such as a cable line on the other. The router or gateway directs the signal to all the devices in the business or home as needed. Some broadband routers contain an integrated modem as a single hardware unit.

Many broadband internet providers supply suitable modem hardware to their customers at no charge or for a monthly fee. However, standard modems can be purchased through retail outlets.

Dial-Up Modems (modulator-demodulator)

Traditional modems used on dial-up networks convert data between the analog form used on telephone lines and the digital form used on computers. An external dial-up modem plugs into a computer at one end and a telephone line on the other end. In the past, some computer makers integrated internal dial-up modems into their computer designs.

Modern dial-up network modems transmit data at a maximum rate of 56,000 bps. However, inherent limitations of telephone networks usually limit modem data rates to 33.6 Kbps (kilobits per second) or lower in practice.

When connecting to a network via a dial-up modem, the devices customarily relay through a speaker the distinguishing sounds created by sending digital data over the voice line. Because the connection process and data patterns are similar each time, hearing the sound pattern helps a user verify whether the connection process is working.

Note: If You like Our Articles Then Please Follow Our Blog For Reading Our Latest Tech Articles. Thanks...
What Is a Role of Modem in Computer Networking? What Is a Role of Modem in Computer Networking? Reviewed by Technowap on January 11, 2019 Rating: 5

No comments :

Powered by Blogger.