WEEK 10 TOPIC: COMPONENTS OF I.C.T CLASS: SS1

Content: Types of Broadcasting:  Radio Broadcasting: This is one way wireless transmission over radio waves intended to reach a wide audience. Audio broadcasting can be done via cable radio, local wire television networks, satellite radio and internet radio via streaming media on the internet. Waves are used for receiving AM and FM radio and for wireless telecommunication use radio waves sent through space from one antenna to another as a medium of communication.  Television Broadcasting: Is a mode of television broadcasting which does not make use of satellite transmission or cables- typically using radio waves through transmitting and receiving antennas or aerials.  Satellite TV Broadcasting: satellite television is a television delivered by means of communication satellite and received by an outdoor antenna, usually a parabolic mirror generally referred to as a satellite dish. TYPES OF TELECOMMUNICATION SYSTEM  PUBLIC SWITCHED TELEPHONE NETWORK (PSTN): PSTN Landline is the network of the world’s public circuit switched telephone networks. It consists of telephone lines, fiber optic cables, micro ware transmission links, cellular networks, communication site and any other. Originally a network of fixed line analog telephone system.  SATELLITE TELEPHONE SYSTEM: A satellite telephone, satellite phone, or satphone is a type of mobile phone that connects to orbiting satellite instead of terrestrial cells site. They provide similar functionally to terrestrial mobile telephones; voice, short messaging service and low bandwidth internet access are supported through most system. Depending on the architecture of a particular system, coverage may include the entire earth, or only specific region.  FIXED WIRELESS TELEPHONE SYSTEM: Fixed wireless refers to wireless devices or systems that are situated in fixed locations, such as an office or home, as opposed to devices that are mobile, such as cell phones. Fixed wireless device normally derive their electrical power from utility mains, as opposed to portable wireless devices that normally derive their power from batteries. The rest are:  Mobile Phone System (GSM): refers to as the global system for mobile communication  Circuit Switched Packet Telephone(CSPT) TYPES OF DATA NETWORK: LAN: Local Area Network WAN: Wide Area Network MAN: Metropolitan Area Network PAN: Personal Area Network Internet LOCAL AREA NETWORK: A LAN connects network devices over a limited geographical area such as schools, home, computer laboratory etc. each device on the network is called the node. WIDE AREA NETWORK: A WAN is a computer network that covers large geographical area such as city, country. It can even span intercontinental distances using communication channel which combines telephone line, cables and air waves. A router connects LANS and WAN. A wan differs from a LAN in many important ways. Most wan are not owned by any one organization but rather exist under a collective partnership and management. WAN tends to use technology like ATM. METROPOLITAN AREA NETWORK: this is a network that connects two or more Local Area Network or campus area networks together, but they are smaller than WAN. MAN is applicable for a city. MAN can be operated by a government or a large corporation. PERSONAL AREA NETWORK: A PAN is a computer network is a network used for communicating among different computers that are close to a particular person. Personal computers, printers, fax machines, telephone, scanner and video game consoles are examples of devices that are used for PAN. A PAN may include wired and wirelesses inter connectivity between computers. The coverage of a PAN usually extends to 10 meters. Wired PAN network is usually constructed with USB and fiber wire while wireless is with Bluetooth. INTERNET: This is a global connection of different computers that are linked together. Internet is a set of networks using IP based tools such as web browsers and file transfer applications. The internet network of an establishment is an example of intranet. An extranet is a network that is limited in scope to a single entity and also has limited connections to the networks of one or more users e.g a company customer may be permitted to some part of its intranets.