GCSE Computer Science (Eduqas)

Topic Summaries

COMPUTER SYSTEMS: Networks

Transmission media

Type Use How data is transmitted Bandwidth Interference Distance
Twistedpair copper Wired LAN connections Electrical signals over copper wire Up to 10 GB/s Twisted pairs reduce interference Up to 100 meters
Fibre-optic cable Longdistance, high-speed WAN Pulses of light through glass fiber Up to 100 TB/s No interference Over 100 km
Radio waves Wireless (WiFi, Bluetooth) Electromagnetic radio signals Up to ~300 MB/s (variable) Prone to interference from other signals Around 60 meters (affected by obstacles)

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