Aarya Dalvi
DCN Question Bank
1) Twisted Pair Cable (2 marks)
Twisted pair cable is a type of guided transmission medium in which two insulated copper wires are
twisted together to reduce noise and interference.
โข It is commonly used in telephone lines and LAN networks.
โข It is low cost and easy to install, but has limited bandwidth and distance.
2)Fibre Optic Cable (4 marks)
Fibre optic cable is a transmission medium that uses light signals to transmit data through thin
strands of glass or plastic fibres.
โข It consists of core, cladding, and protective coating.
โข It provides very high speed and large bandwidth for data transmission.
โข It is immune to electromagnetic interference and has low signal loss.
โข It is widely used in internet, cable TV, and long-distance communication.
3) Satellite Transmission (4 marks)
Satellite transmission is a wireless communication method that uses artificial satellites to transmit
signals over long distances.
โข Signals are sent from an earth station (uplink) to the satellite, which then retransmits them
back to another earth station (downlink).
โข It is used for television broadcasting, internet services, GPS, and communication.
โข It covers a large geographical area, making it suitable for global communication.
โข However, it has high cost and signal delay (latency) due to long-distance transmission.
4) Multiplexing (4 marks)
Multiplexing is a technique used to combine multiple signals into a single transmission channel to
improve efficiency.
โข It allows multiple users to share the same communication medium.
โข Types include Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM),
and Wavelength Division Multiplexing (WDM).
โข At the receiver end, the signals are separated using a demultiplexer.
โข It increases bandwidth utilization and reduces communication cost.
