Chapter 3 (ITN 100)

False

Baud rate is the number of bits transmitted per second.

True

Coding schemes are groups of bits that translate into the "alphabet" of any given system.

true

Data compression can increase the throughput of a communication link.

False

Digital transmission occurs when the signal sent over the transmission media constantly varies among an infinite number of states.

False

Digital transmission produces more errors than analog transmission.

True

Ethernet, a common LAN technology, uses Manchester encoding.

False

Fiber optic cable carries signals in traditional electrical form

True

One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.

False

Propagation delay is negligible with satellite transmission.

False

Radio, microwave and satellite are all examples of guided media.

True

WDM is a version of FDM used in fiber-optic cables.

Serial

When all bits of a character are transferred one after another, the bits are transferred in ___________ mode.

16

When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______.

point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits.

Which is not true about point-to-point circuits?

fiber optic cable

Which of the following is the most secure wired media?

fiber optic cable

Which of the following media can best withstand harsh environmental conditions?

Serial transmission is slower than parallel transmission

Which of the following statements is correct?

bandwidth is constant across any wire, therefore distance is not relevant to its capacity

Which of the following statements is true?

bipolar

Which type of digital signaling would experience fewer errors because it has more distinct signals?

False

With nonreturn to zero signaling, the voltage alternates between zero and a positive or negative voltage.

Return-to-zero signaling

With which type of digital signaling does the signal always return to zero volts after each bit?

circuit configuration

_________ is the basic physical layout of the circuit.

microwave

__________ is a line-of-sight type of wireless media.

Data rate signaling

___________ is not a type of digital signaling technique.

dispersion

___________ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination.

quadrature amplitude modulation

____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.

adaptive differential pulse code modulation

____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.

modulation

____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0.

logical circuit

____________ refers to the transmission characteristics of the circuit.

quantizing error

_____________ refers to the difference between the original analog data and the approximation of that data using the techniques for translating from analog data to digital signals.

Propagation delay

______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission).

False

A codec converts an incoming digital signal to an analog signal for transmission over an analog network.

False

A physical circuit refers to the transmission characteristics of the connection.

Shared

A(n) __________ circuit is another name for a multipoint configuration.

False

ASCII is the least popular code for data communications.

attenuation

Another term for the weakening of a signal over distance is:

False

Frequency division multiplexing divides the circuit into a set of different time slots.

False

Frequency modulation refers to the changing of the height of the sound wave.

Full-duplex

Having a conversation with someone using a cellular phone is an example of ------transmission.

128 Kbps

If each sample uses 16 bits and the number of samples taken each second is 8000; then the transmission speed on the circuit is?

False

In a multi point circuit configuration, each computer can use the circuit at the same time.

True

In full-duplex transmission, two stations can send and receive simultaneously.

digital

In general, networks designed to transmit primarily computer data are likely to be ________.

phase modulation

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

is a type of high frequency radio communication, requires a clear line-of-sight path, is typically used for long distance data transmission, does not require the laying of any cable

Microwave transmission:

False

Multimode fiber is capable of longer transmission distances than single mode fiber.

False

Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

False

Nonreturn to zero is a type of unipolar signaling

True

Statistical time division multiplexing does not require the capacity of the circuit to be equal to the sum of the combined circuits.

bandwidth

The _____________ of a circuit determines a circuit's capacity.

modulator/demodulator

The acronym, Modem, stands for _________________.

False

The cabling that runs from the telecommunications closet to each LAN is called backbone cabling.

Multi mode

The earliest type of fiber optic systems were:

True

The medium is the physical matter or substance that carries the voice or data transmission.

True

The predominant method of transferring information internally in a computer is via parallel mode.

telecommunications closet

The room that contains the cable termination points and the distribution frames is referred to as

twisted pair

The type of media usually installed on homes and businesses by the telephone company is called ____________.

20 to 14,000 Hz

The typical range of human hearing is:

True

Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.

differ widely among media

Transmission speeds: