telecommunication

Question 1

identify the process of sending more than one signal

Answer 1

multiplexing is the process of sending more then one signal down the wire.

Question 2

The transmission of information by electromagnetic radiation depends on the process of… ?

Answer 2

Modulation of information is required for transmission by electromagnetic radiation

Question 3

Identify the name the instrument to determine the usable frequencies of the ionosphere

Answer 3

The I_onosonde_ is the name of the radar used to determine the usable frequencies

Question 4

Communication satellites orbit in … ?

Answer 4

Communications satellites orbit the earth in geostationary orbits.

Question 5

The periodic amplification of optical fibre signals is required due to

Answer 5

Dispersion of the optical signal

Question 6

identify the alternative term for an analogue signal

Answer 6

A continious wave

Question 7

identify the three types of radio propagation

Answer 7

sky wave, direct wave, ground wave

Question 8

compare the benifits of FM over AM radio

Answer 8

• less susceptible to noise and interference
• greater frequency response
• higher fidelity

Question 9

discuss the advantages of satellite communication systems

Answer 9

the path of a radio signal refracted from the ionosphere and the signal hop length are illustrated

Question 10

discuss the advantages of digitisation

Answer 10

• high fidelity
• time dependence
• signals may be coded

Question 11

discuss the use of copper alloys in data transmission

Answer 11

• copper has high electrical conductivity
• is easily drawn into wires
• can be cold worked to obtain a relatively high strength

Question 12

what does AM and FM stand for ?

Answer 12

AM -amplitude modulation

FM -frequency modulation

Question 13

define bandwidth

Answer 13

bandwidth is the diffrence between the upper and lower frequencies of a band of electromagnetic radiation. it is sometimes used to describe the ammount of information that can be transmitted over a communication channel within a peroid of time

Question 14

What is a carrier wave

Answer 14

A carrier wave is an electromagnetic wave that can be modulated as in frequency, amplitude or phase to transmit information.

Question 15

what is fibre optics

Answer 15

fibre optics is the transmission of light signals via optical fibres

Question 16

what is a optical fibre

Answer 16

A optical fibre is a thin fibre made of glass that functions as a waveguide for light by the total internal reflection and used to convey information

Question 17

define dispersion

Answer 17

dispersion is the act or process of scattering. in optical fibres, interactions with impurities in the glass lead to dispersion of the light.

Question 18

what is a multiplexer ?

Answer 18

a multiplexer is a device that can interleave two or more activities. it allows more than one message to be sent over a communication channel at the same time

Question 19

explain what is ment by the term channel in telecommunications

Answer 19

A channel is any path by which a communication may progress from a transmitter to a receiver and can consist of a physical link such as wire or cable or a non-physical link such as electromagnetic radiation

Question 20

what is a sky wave ?

Answer 20

a sky wave is a radio wave that is refracted back to earth by the ionosphere or a communications satellite, it permits transmission around the curve of the earths surface