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7429788
3f Optical Communication Methods
Descrição
A level, A2 IT (Chapter 3) Mapa Mental sobre 3f Optical Communication Methods, criado por Gladys Mba em 23-01-2017.
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ocr
it
ict
a-level
a2
it
chapter 3
a level, a2
Mapa Mental por
Gladys Mba
, atualizado more than 1 year ago
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Criado por
Gladys Mba
mais de 7 anos atrás
33
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Resumo de Recurso
3f Optical Communication Methods
Infrared
Used with remote controls and with laptops to communicate with printers, mobiles and other laptops
Use used most widely before bluetooth
Needs direct line of sight
Maximum distance of only 10m
Cheap to implement
Very restricted bandwidth 115.2kbps
Fibre Optic
Speed of light
Highest bandwidth of all optical communication methods
Used in LANs when obver 100m needs to be coveredand WANs
Low loss of signal and little interference.
Loss of data is rare
Can't be tapped like copper cables
Expensive
Splicing has to be used to fix it. Takes a long time
Lasers.
Two lasers needed to send data from and to each point
No physical connection but travels at speed of light
Needs direct line of sight, difficulties with moving objects
Uses
Aircraft to/from ground
Live sporting events
LAN between close buildings
Military communication where real time data is important
Communication is space- beams can travel thousands of miles
Secure as they are very narrow and only aimed from point to point
Atmospheric conditions can cause interference e.g storms / dust
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