Transmission

Data Exchange/transmissions

• -Methods of transmitting data:
• Simplex, this is where signals only go in one direction at a time.
• Duplex, this is where it can travel in two directions at once.
• 1/2 Duplex, signals that can go in both directions but not simultaneously.
• -Two ways of transmitting data are:
• Serial, this is where bits of data are transferred at one time over wire.
• Parallel, this is where bits of data are transferred simultaneously-an entire byte at one time.
• Advantages
• Serial is good over large distances.
• Parallel is good because it can transfer signals at a much raster rate.
• Disadvantages
• Serial, is very complex, data is broken into individual parts.
• Parallel, its only good for short distances.

Transmission methods

• There are three types of cables:
• UTP/STP, this contains pairs of copper wires which are used for LANs.
• Co-axial, This is a solid copper wire with thick shielding used to connect the TV and aerial.
• Fibre optic, these are strands of glass carry data as light and is used for backbone of a network.

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