Chapter 3

Front 1

_________ systems an transmit in only one direction.

Back 1

Simplex

Front 2

________ is the distance that the signal travels during a single period or cycle.

Back 2

Wavelength

Front 3

________ are used to boost tranmissions of digital signals.

Back 3

Repeaters

Front 4

Width of the spectrum

Back 4

Bandwidth

Front 5

The amount of space left over on a channel is called a _______ it is used to make sure stations do not overlap.

Back 5

gaurdband

Front 6

Radio or broadcast television is this type of system.

Back 6

simplex

Front 7

________ are used to boost tranmissions of analog signals.

Back 7

Amplifiers

Front 8

The relative position in time of a single cycle of the wave is

Back 8

phase

Front 9

Walkie-talkies are an example of this system.

Back 9

half-duplex

Front 10

________ waves are idela for representing the 1s and 0s of digital data.

Back 10

square

Front 11

Name the 5 types of multiplexing.

Back 11

1) Frequency Division
2) Time Division
3) Synchronous Time Division
4) Statistical Time Division
5)Wavelength Division

Front 12

a modulator-demodulator is known as a __________

Back 12

"modem"

Front 13

What is the height of a wavelength called.

Back 13

amplitude

Front 14

Systems that can transmit both directions but only one at a time are called ________ sytems.

Back 14

half-duplex

Front 15

____________ represents binary values as diffrent aplitudes

Back 15

Amplitude-shift keying (ASK)

Front 16

by adding more _______ the closer to a square wave we will get.

Back 16

frequencies

Front 17

_________ is the number of bits per second (bps) that a signal can carry.

Back 17

Throughput

Front 18

The rate of which wves repeat is called:

Back 18

frequency

Front 19

NRZ as in NRZ-L stands for

Back 19

Nonreturn to zero

Front 20

If a wave has a high frequency then it has shorter _________.

Back 20

wavelengths

Front 21

In a digital sytem how are 1s and 0s created?

Back 21

A positive voltage level is used for a 1 and a negitive level for a 0.

Front 22

Why is a repeater better that an amplifier?

Back 22

With an amplifier the signal just gets boosted even with errors that might be in the sinal. A repeater regenerates the bits before resending it making the signal exactly like it was when origanlly transmitted.

Front 23

Diffrence between highest and lowest frequencies in the spectrum is called:

Back 23

bandwidth

Front 24

Frequency is measured in

Back 24

hertz or cycles per second.

Front 25

If the transmission system is able to use diffrent parts of the fequancy spectum to send diffrent signals it is called _________ transmission.

Back 25

broadband

Front 26

The human voice is a example of what kind of signal

Back 26

analog.

Front 27

The three parameters used to characterize a wave are:

Back 27

amplitude, frequency, and phase.

Front 28

premises wiring

Back 28

including telephone wiring on an organization;s premeises, is established by the TIA/EIA

Front 29

Range of frequencies to creat a signal is called

Back 29

spectrum

Front 30

the change the frequency of a signal is called

Back 30

frequency modulation

Front 31

Cable modems are examples of ___________ systems.

Back 31

full duplex

Front 32

This indicates a strength of the signal.

Back 32

Amplitude

Front 33

A Carrier signal is called a

Back 33

channel.

Front 34

AM stands for

Back 34

Amplitude modulation

Front 35

This type of multiplexing is used for cable television.

Back 35

Frequency Division

Front 36

__________ is used to combine muliple signals on a single communication circuit.

Back 36

Multiplexing

Front 37

FM stands for

Back 37

Frequency modulation

Front 38

PM stands for

Back 38

phase modulation

Front 39

If the entire spectrum supported by a medium is used to transmit one signal the system is using ____________ transmission.

Back 39

baseband

Front 40

Systems that can transmit both directions are called __________ systems.

Back 40

full-duplex

Front 41

Name some advantages of Digital Transmissions over analog.

Back 41

1)greater bandwidth
2)better encryption
3)lower error rates
more easily updated

Front 42

__________ is the number of discrete signals that can occur in a unit of time.

Back 42

Baud rate

Front 43

_____________ represents binary values as diffrent fequencies.

Back 43

Frequency-shift keying (FSK)

Front 44

_____ is more noise resistent and efficient than ASK and FSK

Back 44

Phase-shift keying (PSK)

Front 45

Pulse-code modulation is?

Back 45

a technique for converting voice analog into digital form for transmission.

Front 46

In a _________ encoding a 0 is respresented by a voltage change from low to high while a 1 is represented by a voltage from high to low.

Back 46

Manchester

Front 47

Is octet the same as a byte?

Back 47

No