ITN 100 Chapter 3 Study Guide

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

digital

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

digital coding

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

fiber optic cable

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

full-duplex

The two basic types of media are:

guided and wireless (radiated)

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

A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.

multiplexer

Frequency division multiplexing:

operates by dividing the signal into different frequencies

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

physical

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

When converting analog voice data to digital signals, Pulse Code Modulation typically samples the incoming voice signal _______ times per second

8,000

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

_____________ can be thought of as dividing the circuit horizontally.

Frequency division multiplexing

Which of the following is not a key advantage of digital transmission?

It permits only low transmission rates.

Ethernet uses

Manchester encoding

The acronym, Modem, stands for _________________.

Modulator/demodulator

The earliest type of fiber optic systems were:

Multimode

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

V.44

___________ is commonly used to transmit phone conversations over digital networks.

VOIP

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

attenuation

A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters.

1024

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

The height of a sound wave is called its:

Amplitude

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

Amplitude Modulation

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

DSL modem

___________ is not a type of digital signaling technique.

Data rate signaling

Two fundamentally different types of data are:

Digital and analog

Which of the following statements is correct?

Serial transmission is slower than parallel transmission.

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

adaptive differential pulse code modulation

Microwave transmission:

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

The _____________ of a circuit determines a circuit's capacity

bandwith

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

bipolar

Which of the following is the most secure wired media?

fiber optic cable

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

fiber optic cable

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

phase

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

phase modulation

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

return-to-zero signaling

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

serial

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

synchronous time division

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

telecommunications closet