Network Communication Technology
An Intranet is an internal network that uses Internet technologies and it is a
small version of the Internet that exists within an organisation. It is a private
computer network that uses Internet protocols, network connectivity and
possibly the public telecommunication system to securely share part of an
organisation’s information or operation with its employees.
An extranet is a private network that uses Internet protocols, network
connectivity, and possibly the public telecommunication system to securely
share part of a business’s information or operations with suppliers, vendors,
partners, customers or other businesses.
The Internet is the worldwide, publicly accessible system of interconnected
computer networks that transmit data by packet switching using the standard
Internet Protocol (IP). It consists of millions of smaller business, academic,
domestic and government networks, which together carry various information
and services, such as electronic mail, online chat, and the interlinked Web
pages and other documents of the World Wide Web.
Communication Device
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| Network Interface Card (NIC) |
Function :
- A network card adapter card or PC card that enables the computer to access the network.
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| Wireless Network Interface Card (WNIC) |
Function :
- A network card that provides wireless data transmission.
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| Internal Modem |
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| External Modem |
Function :
- A modem is a device that enables a computer to transmit data over telephone or cable lines.
- Coverts Analog signal to digital signal, vice versa.
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| Hub |
Function :
- Hubs/Switch are commonly used to connect segments of a LAN.
- A router is a communications device that connects multiple computers or other routers together and transmits data the correct destination.
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| Wireless Access Point |
Function :
- A wireless access point is a central communications device that allow computers to transfer data.
- This device can help information to be transferred wirelessly to other wireless devices or to a weird network.
Communication Technology
Telephone/Mobile Phone
Since the telephone's invention by Alexander Graham Bell in March of 1876, the telephone has come a long way. Telephones used landlines to send signals across the country, and later made use of undersea cables to let people communicate with those in other countries. The first cell phone, as the term is commonly understood, was invented in 1973, the first call being made by Dr. Martin Cooper of Motorola to his rival at Bell Labs. Since then, phones have come to enable much more than vocal communication, using tower and satellite signals to send text messages and data such as video and images.
Radio
Early radio communication was used primarily by the sea vessels in the 1900s and 1910s, with naval and merchant vessels making use of the technology for communicating with other ships. Radio on land started with advertising, but producers knew that people wouldn't listen unless they were entertained. Drama programs soon became a staple of popular radio in the late 1920s and early 1930s. Radio has since expanded to be a dominant form of communication technology; in September 2011, the FCC reported that there were 14,865 radio stations in the U.S. alone.
Television
Full-scale television broadcasting in the US began in 1947, and at first, many thought it would not last. Inventor Lee DeForest said, "While theoretically and technically television may be feasible, commercially and financially it is an impossibility." However, in the year 2010, U.S. households had over 115 million TVs, with almost 99 percent of households reporting owning at least one set. There are now thousands of TV channels covering everything from sports and music to reality shows, game shows and even adult entertainment.
