SS3 First Term Computer Studies Lesson Note – Cables and Connectors

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WEEK 6.                                                       

TOPIC: CABLES AND CONNECTORS

CONTENT:

(a) Network cables and connectors (i) Cables –Twisted pair, Coaxial, Fiber optic, Telephone (ii) Connectors –RJ45, RJ11&T-Connectors.

(b) Computer cables and connectors (i) Power cables (ii) Data cables – Printer cable, Universal Serial Bus (USB), Monitor cable & Serial cable. (iii) Connectors – Male & Female.

Sub-topic 1: Network cables and connectors

The main reason why we set up a network is for easy transfer of digital information from one computing device to another. We can set up a network in two forms: either wireless or wired. For wired network, we make use of some cables that are linked together by connectors to facilitate communication. Also, for wireless, infrared, or radio-frequency transmitter are used to enhance communication but they are usually low speed compared to wired networks.

Cables

A cable is the medium through which information transverses from one network device to another. There are several types of cable which are commonly used with Local Area Networks (LANs).

1. Twisted Pair: It is a type of wiring in which two conductors are twisted together for the purposes of cancelling out electromagnetic interference (EMI) form external sources. Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company. To reduce crosstalk or electromagnetic induction between pairs of wire, two insulator copper wires are twisted around each other.
2. Coaxial Cable: It is an electrical cable with an inner conductor surrounded by a flexible, tubular insulating layer and a tubular component part. A plastic layer provides insulation between the centre conductor and a braided metal shield. The metal shield helps to block any outside interference.

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