Question 1

The two types of digital data transmission are baseband and highband.

Accepted Answer

The two types of digital data transmission are baseband and broadband.

Question 2

When data is transmitted without modulation, it is called broadband transmission.

Accepted Answer

When data is transmitted without modulation, it is called baseband transmission, not broadband. Broadband transmission typically involves modulation and is used for sending multiple types of signals over a wide range of frequencies.

Question 3

The three components of a data transmission system are a sending device, receiving device, and transmission medium.

Accepted Answer

These are indeed the three fundamental components of a data transmission system: the sending device (source), the receiving device (destination), and the transmission medium (the physical or wireless pathway through which data is transmitted from sender to receiver).

Question 4

The simplest connection between sending and receiving devices is a coaxial cable.

Accepted Answer

The simplest connection between sending and receiving devices is often considered to be a twisted pair cable, not a coaxial cable. Twisted pair cables, such as those used in traditional telephone systems and Ethernet networks, are simpler and more cost-effective for basic connectivity.

Question 5

Coaxial connections typically use BNC connectors.

Accepted Answer

Coaxial connections often use BNC connectors for various applications, including video and Ethernet networks, due to their reliable and secure connection.

Question 6

An advantage of twisted pair cable is that cross- talk is minimized.

Accepted Answer

Twisted pair cables are designed with pairs of wires twisted around each other to minimize electromagnetic interference and crosstalk from adjacent pairs and external sources, enhancing signal integrity.

Question 7

Optical fiber cables get their name from originally carrying video communications.

Accepted Answer

Optical fiber cables get their name because they transmit data as light pulses, not specifically for carrying video communications.

Question 8

Optical fiber cables can support faster data rates than copper conductors.

Accepted Answer

Optical fiber cables have a much higher bandwidth than copper cables, allowing them to support faster data transmission rates over longer distances without signal degradation.

Question 9

Optical fiber is used when a data transmission system requires a cheap transmission medium.

Accepted Answer

Optical fiber is often chosen for its high data transmission rates and lower signal degradation over long distances, not for being cheap; it can be more expensive than other mediums like copper cables.

Question 10

In multimode propagation light propagates through the fiber core as a single ray.

Accepted Answer

In multimode propagation, light propagates through the fiber core along multiple paths or modes, not as a single ray.

Question 11

Single- mode propagation has greater bandwidth than multimode propagation.

Accepted Answer

Single-mode fiber allows only one mode of light to propagate, which significantly reduces the dispersion of the signal, allowing for higher bandwidth and longer transmission distances compared to multimode fiber, which supports multiple modes of light that can lead to modal dispersion and lower bandwidth.

Question 12

Wireless transmission systems do not have a physical connection between the sending and receiving systems.

Accepted Answer

Wireless transmission systems use electromagnetic waves to transmit data, eliminating the need for physical cables or connections between the sender and receiver.

Question 13

Wireless communication in the infrared frequency band are limited to line- of- sight communications.

Accepted Answer

The answer of Wireless communication in the infrared frequency band...

Question 14

In general, parallel data transmission is faster than serial data transmission.

Accepted Answer

Parallel data transmission sends multiple bits of data simultaneously over multiple channels, which generally allows for faster data transfer compared to serial transmission, where data is sent bit by bit over a single channel.

Question 15

An advantage of parallel communications is that multiple transmission lines avoid skew in the transmitted data.

Accepted Answer

Parallel communications can actually introduce skew because each parallel line might have slightly different electrical characteristics, causing bits to arrive at slightly different times.

Question 16

Serial- to- parallel and parallel- to- serial converters allow computers to communicate with external devices.

Accepted Answer

Serial-to-parallel and parallel-to-serial converters are used to enable communication between computers and external devices by converting data from serial (data transmitted bit by bit) to parallel format (multiple bits transmitted simultaneously) and vice versa, facilitating compatibility between different types of data transmission systems.

Question 17

In asynchronous communication systems, the sender and receiver oscillators operate at the same frequency.

Accepted Answer

The answer of In asynchronous communication systems, the sender and...

Question 18

Baud rate is another term for bit rate.

Accepted Answer

Baud rate refers to the number of signal changes or symbols transmitted per second, while bit rate is the number of bits transmitted per second. They can be different depending on how many bits are represented by each symbol.

Question 19

The data efficiency of a system is the percentage of the total communications time spent transmitting data bits.

Accepted Answer

The answer of The data efficiency of a system is...

Question 20

In a synchronous communications system, the receiving system provides the clock signal.

Accepted Answer

In a synchronous communications system, it is typically the transmitting system that provides the clock signal, ensuring that both the transmitter and receiver are synchronized.

Quiz 13: Data Transmission