WCM - Chpt1

List the three basic components of a communication system.

• Transmitter, Modulator, Antenna

• Transmitter, Receiver, Communication Channel

• Encoder, Decoder, Modulator

• Source, Destination, Feedback

List three different types of media are used in communication systems.

• Water, Fiber optics, Paper

• Satellite, Television, Radio

• Electrical Conductors, Optical Media, Free Space (Air)

• Glass, Metal, Air

The figure below shows a type of communication link

(a)  State the type of communication link

(b)  Explain the operation of this communication link

• a) Simplex Communication Link

  b) Information travel in one direction only

• a) Half Duplex Communication Link

  b) Information travel in two directions

• a) Full Duplex Communication Link

  b) Information travel in two directions

• a) Simplex Communication Link

  b) Information travel in two directions

Explain the difference between a ‘Simplex’ and ‘Full-Duplex’ link.

• •travels in one direction only.

  • travels in two directions simultaneously.

• •travels in two directions.

  • travels in one direction simultaneously.

• •travels in two directions.

  • travels in two directions simultaneously.

• •travels in one direction only.

  • travels in one direction only.

State an advantage of ‘Serial’ digital transmission mode

• It is used for longer distance transmission as there are no ‘skew’ problems

• Higher data transfer rate

• Simultaneous transmission of multiple bits

• Lower latency compared to parallel transmission

State 2 advantages of ‘Digital Transmission’.

• Easy integration with analog signals and higher power consumption

• Limited distance transmission and difficult to store signals

• Maintain Data Integrity, Transmit Longer Distance

• Higher error rates and lower noise immunity

State the various types of ‘Multiple Access’ scheme

• FDM, TDM, CDM, SDM

• Single Access (SA), Hybrid Access (HA), Mixed Access (MA)

• FDMA, TDMA, CDMA, SDMA

• Simple Access (SA), Dual Access (DA), Multi Access (MA)

What does ‘TDMA’ stand for?

• Time Division Multiplexing Access

• Time Data Multiplexing Access

• Time Division Multiple Access

• Time Data Multiple Access

What does 'CDMA' stand for?

• Code Division Multiple Access

• Code Data Multiplexing Access

• Channel Division Multiplexing Access

• Channel Data Multiple Access

What does ‘FDMA’ stand for?

• Frequency Data Multiplexing Access

• Frequency Division Multiple Access

• Frequency Data Multiple Access

• Frequency Division Multiplexing Access