SS1 Third Term Computer Studies Lesson Note – Communication Systems II

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WEEK 4

TOPIC: COMMUNICATION SYSTEMS II

CONTENT: ­

1. Data networks: PAN, LAN,MAN, WAN
2. Information systems: Data processing system and global positioning system.

SUB-TOPIC 1:   DATA NETWORKS

DATA NETWORKS: are telecommunication networks that are operated for the exchange of information between data communication devices such as computers. Data networks can transfer any type of digital media such as voice, text, or video in the form of data from one device to another. data network is a telecommunications network that allows computers to exchange data.

TYPES OF DATA NETWORKS:

1. Personal Area Network (PAN) – This is a computer network organized around an individual person. An individual connects his mobile computer, cell phone, or handheld computing devices such as PDA together in the network. This could be inside a small office or residence. This type of network provides great flexibility. For example, it allows you to:

• Send a document to the printer in the office upstairs while you are sitting on the couch with your laptop.
• Upload a photo from your cell phone to your desktop computer.
• Watch movies from an online streaming service to your TV.

If this sounds familiar to you, you likely have a PAN in your house without having called it by its name

1. Local Area Network (LAN) – This includes a group of computers in close proximity to each other, such as in an office building, a school, or a home. A LAN is useful for sharing resources like files, printers, games, or other applications. If you would want somebody just walking outside to be able to send a document to the printer from their cell phone! If a local area network, or LAN, is entirely wireless, it is referred to as a wireless local area network, or WLAN.

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