CIS 4348 Ch. 3

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

dispersion

The ability to transmit in both directions, but only in one direction at a time is an example of _______________ transmission.

half-duplex

To get more "bandwidth" in a digital transmission, you must:

increase the range of frequencies available for a transmission

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

microwave

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

mircowave

The acronym, Modem, stands for _________________.

modulator/demodulator

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

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

Which of the following is not an important factor to consider when selecting media to be used in a network?

prestige value of the type of media

_____________ 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.

quantizing error

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

shared

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it

splits the communication circuit vertically (with time slots) instead of horizontally

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

16

The typical range of human hearing is

20 to 14,000 Hz

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels?

6

If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is

9100 Hz

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it:

splits the communication circuit vertically (with time slots) instead of horizontally

When you send an email from the US to Europe, it likely is transmitted from one continent to another through one of the ______ that connect America and Europe

submarine cables

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

twisted pair

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

wavelength division multiplexer

_________ is the basic physical layout of the circuit.

Circuit Configuration

Based on the TIA/EIA 568-B structured cabling standard, the cabling that runs from the telecommunications closet to each work area is called backbone cabling.

Falr

Baud rate is the number of bits transmitted per second.

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.

False

In simplex transmission, the data flows in both directions at the same time

False

Propagation delay is negligible with satellite transmission.

False

Serial mode transmission is much faster than parallel mode transmission.

False

Wavelength division multiplexing can only used with copper cables.

False

Which media can best withstand harsh environmental conditions?

Fiber optic cable

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

Modulating

Data is physically transmitted from one computer or terminal to another in the ________ layer.

Physical

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

Propagation delay

A walkie-talkie is an example of half-duplex transmission.

True

Data compression can increase the throughput of a communication link.

True

Ethernet, a common LAN technology, uses Manchester encoding.

True

Frequency is the number of cycles per second and is expressed in Hertz

True

Frequency is the number of cycles per second and is expressed in Hertz.

True

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

True

Microwave transmissions require a line of sight between any two points.

True

Of all the media available, fiber optic provides the highest transmission speeds.

True

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.

True

Radio data transmission requires that each device has a radio receiver/transmitter and uses a specific frequency.

True

Serial transmission is slower than parallel transmission.

True

Signal bandwidth is the difference between the highest and lowest frequencies in a band.

True

The "local loop" refers to the wires that run from the customer premises to the telephone switch of the telephone company.

True

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

True

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

True

______ is a modem standard that uses Lempel-Ziv encoding to compress data.

V.44

With respect to converting digital data into analog signals, AM stands for:

Amplitude Modulation

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

128 Kbps

____________ is one of the most commonly used coding schemes used in data transmission.

ASCII

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

Bandwidth

A _________ is an FDM device that splits the physical circuit into three logical circuits (phone, upstream data, downstream data).

DSL modem

The representation of the character A by the group of 8 bits, 01000001, is an example of:

Digital Coding

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

false

Which media has the lowest error rates and the highest transmission speeds?

fiber optic cable

The direction in which the sound wave begins is known as:

phase

_____________ is not a form of modulation used to transform digital data into analog signals.

synchronous time division