Data Midterm

Question 1

A cable laid on the seabed between land-based stations to carry telecommunication signals across stretches of ocean and sea.

Answer 1

Submarine Communications Cable

Question 2

Are fiber optic cables that connect countries across the world via cables laid on the ocean floor. These cables – often thousands of miles in length

Answer 2

Submarine cables

Question 3

Fiber-optic cables transmit data via fast-traveling pulses of _______.

Answer 3

light

Question 4

Modern submarine cables use ______. Lasers on one end fire at extremely rapid rates down thin glass fibers to receptors at the other end of the cable.

Answer 4

Fiber-optic Technology

Question 5

Using analog methods for long-distance communication suffers from distortion, delays, interferences, and other losses.

Answer 5

Data transmission

Question 6

Refers to the exchange of information using a specific medium, such as vacuum, space, wireless medium, wired medium, etc.

Answer 6

Communication

Question 7

In electromagnetic wave that carries information from one place to another, using a specific propagation medium, such as air, vacuum, water, and solid. In electronics,

Answer 7

Signal

Question 8

Are generally used in analog communication at transmitting and receiving ends to remove the noise.

Answer 8

Filters

Question 9

A signal represented in the form of discrete values is known as _____. It is transmitted in the form of bits.

Answer 9

digital signal

Question 10

The signal is demodulated and the source signal is recovered from the carrier signal.

Answer 10

Digital Demodulator

Question 10

The device used to convert one form of energy to another. In a communication system, it converts the non-electrical energy to electrical energy to make it suitable for transmission within the system. In the case of the analog input, the block also contains an ADC

Answer 10

transducer

Question 10

The communications process means breaking down the communication process into smaller and easier to handle interdependent categories, with each solving an important and somehow distinct aspect of the data exchange process

Answer 10

Layering

Question 11

A digital communication system, information is sent as a sequence of digits that are first converted to an analog form by ________ at the transmitter and then converted back into digits by de-modulation at the receiver.

Answer 11

modulation

Question 11

Method used to digitally represent sampled analog signals

Answer 11

Pulse Code Modulation

Question 12

It easier to transmit and offer less room for errors to occurs

Answer 12

Digital Signals

Question 13

It involves switching the carrier wave between two set frequencies.

Answer 13

Frequency Shift Keying

Question 14

the output of these sampling, quantizing and coding stages is the __ that can then be stored as a file of digital bits or transmitted along digital links

Answer 14

PCM data

Question 15

It represented by continuously varying voltages or currents in proportion to the amplitude of the signals to be transmitted

Answer 15

Analog Signals

Question 16

the number of bits that can be sent over transmission medium per second.

Answer 16

Bit rate

Question 17

the rate at which the number of signal elements or changes to the signal occurs per second when it passes through a transmission medium.

Answer 17

Baud rate

Question 18

The radio signals, television and telephone system were essentially in signal of ______

Answer 18

Analog signals

Question 19

this leads to accurate data transmission that in turn leads to faster transmission rates and better productivity

Answer 19

Digital signals

Question 19

the baud rate for communication systems means _ .

Answer 19

symbol rate

Question 20

The AFSK base band signals may be transmitted __ by other techniques such as AM and FM

Answer 20

radio links

Question 21

what is FM

Answer 21

Frequency Modulation

Question 22

what is AM

Answer 22

Amplitude Modulation

Question 23

the majority of communication however, still originated in the physical world as __, mainly voice and such signals must be converted to some digital form

Answer 23

sound and images