Network and Communication Part F

Network and Communication Part F

1. Infrared

   • Used for many things in life such as remotes and early laptops
     • These laptops used the infrared to communicate with other laptops/printer
   • Used by mobile phones to give them extra capabilities such as acting as an all in one remote
   • Main use of wireless communication before bluetooth
   • Requires direct line of sight and has to be close
   • Bandwidth is restricted to 115.2 Kbps
   • Requires little power
   • Cheap to implement for one-way communictations e.g remote controls

2. Fibre-Optic

   • These have the highest bandwidths of all of the optical communication methods
   • Used in LAN's for distances over 100m
   • These have a low loss of signal and no interference, this in turn results in a low loss of data packets
   • Can't be tapped so is more secure
   • Can be used to broadcast television and also internet services
     • The internet services are using fibre-optic cables to go to the cabinets and then the final connection is done with copper cables
   • It is expensive and damaged cables take ages to repair
     • If large sections of cable are damaged then it has to be broken and repaired which results in loss of connection to many homes

3. Laser

   • Have a clear line of sight between two devices
   • Travels the speed of light like fibre, but does not need any physical connection
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