Cambridge IGCSE Computer Science (0478) · lesson 11 of 35 · 20 min
Wired Transmission Media
Wireless Transmission Media
Fibre Optic — How It Works
Fibre optic cables transmit data as pulses of light through a glass or plastic core. Light travels by total internal reflection — bouncing along the core without escaping. Advantages: immune to electromagnetic interference, very high bandwidth, low signal loss over long distances. Disadvantage: expensive to install and repair.
Which transmission medium is immune to electromagnetic interference?
- Twisted pair copper
- Coaxial cable
- Fibre optic
- Wi-Fi
Answer: Fibre optic
Fibre optic uses light, not electrical signals, so EMI has no effect.
What is the typical maximum segment length for Cat6 Ethernet?
- 10 m
- 100 m
- 500 m
- 1000 m
Answer: 100 m
Twisted pair Ethernet is limited to 100 m per segment.
Bluetooth is primarily used for:
- WAN connections
- LAN backbone
- Personal Area Networks
- Satellite links
- Answer: 2
Bluetooth is a short-range PAN technology.
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