SS TWO WEEK EIGHT LESSON NOTE (ICT_223)

 COMPUTER CABLES AND CONNECTORS


A computer cable can either be a power cable or a data cable.
A.      A power cable is any cable that powers the device. The power cord that connects to your computer and a Molex style cable inside the computer are both good examples of power cables.












Molex cable

                           
B.      A data cable is any media that allows baseband transmission (binary 0s and 1s)from a transmitter to a receiver.  The following data cables exist:
a.       Serial (RS-232) : serial input/output cable that uses either a 25-pin or 9-pin connector. Some modern printers do still use these cables, but most modern computers only feature minimal support for both the 25-pin and 9-pin connectors, necessitating an adapter in most cases.
b.      Parallel cable: parallel cables typically have different connectors on either end of the cable – a DB-25 25-pin connector that connects to the computer much like serial cable, and the 36-pin micro ribbon connector that connects to the printer. It can also be used for a scanner.


c.       Firewire: FireWire is a digital bus with a bandwidth of 400-800 Mbps. It can handle up to 63 units on the same bus, and is hot swappable. It was first developed by Apple in 1995.





d.      High Definition Multimedia Interface, HDMI is a connector and cable capable of transmitting high-quality and high-bandwidth streams of audio and video between devices. The HDMI technology is used with devices such as an HDTV, Projector, DVD player, or Blu-ray player.




e.       Universal Serial Bus, USB (pronounced yoo-es-bee) is a plug-and-play interface that allows a computer to communicate with peripheral and other devices. USB-connected devices cover a broad range; anything from keyboards and mice, to music players and flash drives.

USB 2.0USB 3.0
USB 1.0










Connectors

Electrical connector is a device for joining electrical circuits together (sometimes known as ports, plugs, or interfaces)

A male connector is a connector attached to a wire, cable, or piece of hardware, having one or more exposed, unshielded electrical terminal s, and constructed in such a way that it can be inserted snugly into a receptacle (female connector) to ensure a reliable physical and electrical connection. This type of connector is also known as a plug. A male connector can be recognized by the fact that, when it is disconnected or removed, the unshielded electrical prongs are plainly visible.




A female connector is a connector attached to a wire, cable, or piece of hardware, having one or more recessed holes with electrical terminals inside, and constructed in such a way that a plug with exposed conductors (male connector) can be inserted snugly into it to ensure a reliable physical and electrical connection. A female connector is also known as a jack, outlet, or receptacle. This type of connector can be recognized by the fact that, when it is disconnected or removed, the electrical conductors are not directly exposed, and therefore are not likely to make accidental contact with external objects or conductors.

 

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