What is telecommunications (telecom)?

What is telecommunications (telecom)?

Telecommunications, usually referred to as telecom, is the electronic transfer of information over great distances, including voice, data, and video. This is a broad phrase that covers a variety of information-transmitting technologies and communications infrastructures, including telegraphs, landline phones, mobile phones, satellites, microwave communications, fiber optics, and radio and television broadcasts.

Two stations, each with a transmitter and a receiver, make up a full, single communications circuit. Any station’s transmitter and receiver could be merged into a single gadget known as a transceiver. Electrical wire or cable, sometimes known as copper, optical fiber, electromagnetic fields, or light can all be used as the signal transmission medium. Wireless communications refers to electromagnetic field-based data transmission and receiving in free space.

The carrier, often known as the carrier wave, is the electrical signal used to transport data in a telecommunications circuit. A carrier needs to be modulated in some way in order to transmit information. The modulation mode can be broadly divided into analog and digital. In analog modulation, a portion of the carrier is continuously altered. Amplitude modulation (AM), which is still used in radio broadcasting at some frequencies, is the first type of analog modulation. The oldest type of digital modulation existed before AM; it was called Morse code. Internet protocols are used in modern telecommunications to transmit data across underlying physical transfers.

Internet service providers (ISPs), telecom equipment suppliers, wireless service providers, radio and television broadcasters, cable companies, satellite television providers, and managed service providers are just a few of the many organizations that offer various types of telecommunications services (MSPs). The makers of telecom equipment, telecom services, and wireless communications are the three primary sectors within the telecom business. The largest industry among these sectors is telecom equipment, which comprises wireless semiconductors, analog or digital public switching equipment, and customer equipment like routers and modems. The smallest industry is wireless communications.

The development of communications

The Latin verb communicare, which means “to share,” is joined with the Greek prefix tele-, which means “distance,” to get the phrase telecommunications. The telegraph, telephone, radio, television, videotelephony, satellites, closed computer networks, and the public internet are all significant telecommunications technologies.

  • 1876–  The first telephone was invented by Alexander Graham Bell. This early model required an interpreter, or telegrapher, at both ends. These first telephones were intercom systems, where two phones were connected directly.
  • 1877. The invention of the switchboard exchange telephone system enabled any combination of two phone lines to connect and talk with each other.
  • 1891. Dial telephones were invented, which bypassed the need for an operator on each call. This made it much quicker and easier to make calls via telephone.
  • 1947. The transistor was invented, which led to the development of modern electronics, such as computers and calculators.
  • 1948. Microwaves began to be used to transmit phone signals, in places where phone wires did not exist.
  • 1960. Phones began to transition from mechanical switching to electronic switching, which enabled features such as voice messaging, speed dialing and caller ID.
  • 1984. The Bell System, which provided AT&T with a near-monopoly over telecommunications services in the U.S., was broken up, opening up space for competition for other providers.
  • 1984. Cellular and personal communications service. phone use, which offered mobile communications beyond two-way radio use, was introduced.
  • 1990s. Use of the modern internet became widespread.
  • 2000s and beyond. The first decade of the 2000s saw mobile phones grow increasingly sophisticated. By 2012, smartphone usage was widespread.

Modes of telecommunication

Information is transmitted electronically over distances through telecommunications. The data could take the shape of voice calls, data, text, photos, or video. These days, telecommunications are utilized to connect relatively far-flung computer systems into networks.

  • E-mail.
  • Fax.
  • Instant messaging.
  • Radio.
  • Satellite.
  • Telegraphy.
  • Telephony.
  • Television broadcasting.


Email, or electronic mail, is a communication technique that sends messages via electronic devices across computer networks. The term “email” can apply to both the method of delivery and the specific messages that are sent and received. One of the most crucial talents a marketer should possess is email authoring. Many emails compete daily for contacts’ attention; effective authoring abilities are what separate successful campaigns from those that will wind up in spam.


The telephonic transmission of scanned-in printed information (text or images) to a telephone number typically associated with a printer or other output device is known as a fax (short for facsimile; also known as telecopying). Typical fax machines are made to scan printed text and graphics before transmitting the data over the phone network to equivalent devices, where facsimiles are reproduced in a manner that closely resembles the original documents.

Instant Messaging

In general, instant messaging is a text-based application that enables users to have online discussions by sending and receiving brief messages almost simultaneously. The term “instant messaging,” or “IM,” is frequently used to refer to a function that lets users see which other users are connected and online through a specific instant messaging application. Depending on the system being used, presence also provides information about other companions’ availability.


Radio is a form of sound transmission over radio waves that often involves the distribution of music, news, and other programming from a single broadcast station to a large audience of listeners with radio receivers. Since its inception at the turn of the 20th century, broadcast radio has astounded and pleased the people by delivering news and entertainment with a promptness that was previously unimaginable. Radio evolved as the first electronic mass medium between 1920 and 1945, dominating “the airwaves” and helping to create a generation of mass culture together with newspapers, magazines, and movies.


An expert in satellite technology can install and fix satellite dishes. Usually, these dishes transmit Internet or TV signals. With this job, you’ll be responsible for setting up the dish, routing the cable where it needs to go, and making sure the service is operational and linked to the customers’ devices. You must possess exceptional problem-solving skills and accuracy in order to succeed as a satellite technician. In the end, a top-notch satellite technician should be able to quickly identify and fix technical problems while also provide exceptional customer service.


To send and receive signals or messages, use a telegraphic typewriter, telegraph key, teletype machine facsimile, and related devices. Prepare messages using the guidelines provided. Check for and fix message errors. for proper operation, equipment may need to be adjusted. A telegraph is a tool used in telegraphy, or the transmission and reception of communications over large distances. Nowadays, an electrical telegraph is commonly referred simply by the word “telegraph” alone. Transmission of communications using telegraphic codes over radio is known as wireless telegraphy.


The installation, maintenance, and management of District telephone systems (PBX & VIOP), including network LAN cabling, placement, termination, testing, labeling, LAN switch configuration, and documentation, will fall under the purview of the Telephony/Network (Electronics) Technician. Monitors and operates the switchboard including answering and directing incoming calls, placing outgoing calls, overhead paging and emergency response communication.

Television Broadcasting

Television broadcasting is a type of radio broadcasting in which a television signal is sent by radio waves from an Earth-based terrestrial (TV station) transmitter to TV receivers equipped with an antenna. Television provides hours of entertainment and news for our viewing purposes. The Three Major Networks: NBC, CBS, and ABC provided a beginning for other broadcast companies. The programs that they offered spanned from situational comedies to dramas, which is very similar to television programming today.