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47 Cards in this Set

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_________ systems an transmit in only one direction.
Simplex
________ is the distance that the signal travels during a single period or cycle.
Wavelength
________ are used to boost tranmissions of digital signals.
Repeaters
Width of the spectrum
Bandwidth
The amount of space left over on a channel is called a _______ it is used to make sure stations do not overlap.
gaurdband
Radio or broadcast television is this type of system.
simplex
________ are used to boost tranmissions of analog signals.
Amplifiers
The relative position in time of a single cycle of the wave is
phase
Walkie-talkies are an example of this system.
half-duplex
________ waves are idela for representing the 1s and 0s of digital data.
square
Name the 5 types of multiplexing.
1) Frequency Division
2) Time Division
3) Synchronous Time Division
4) Statistical Time Division
5)Wavelength Division
a modulator-demodulator is known as a __________
"modem"
What is the height of a wavelength called.
amplitude
Systems that can transmit both directions but only one at a time are called ________ sytems.
half-duplex
____________ represents binary values as diffrent aplitudes
Amplitude-shift keying (ASK)
by adding more _______ the closer to a square wave we will get.
frequencies
_________ is the number of bits per second (bps) that a signal can carry.
Throughput
The rate of which wves repeat is called:
frequency
NRZ as in NRZ-L stands for
Nonreturn to zero
If a wave has a high frequency then it has shorter _________.
wavelengths
In a digital sytem how are 1s and 0s created?
A positive voltage level is used for a 1 and a negitive level for a 0.
Why is a repeater better that an amplifier?
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.
Diffrence between highest and lowest frequencies in the spectrum is called:
bandwidth
Frequency is measured in
hertz or cycles per second.
If the transmission system is able to use diffrent parts of the fequancy spectum to send diffrent signals it is called _________ transmission.
broadband
The human voice is a example of what kind of signal
analog.
The three parameters used to characterize a wave are:
amplitude, frequency, and phase.
premises wiring
including telephone wiring on an organization;s premeises, is established by the TIA/EIA
Range of frequencies to creat a signal is called
spectrum
the change the frequency of a signal is called
frequency modulation
Cable modems are examples of ___________ systems.
full duplex
This indicates a strength of the signal.
Amplitude
A Carrier signal is called a
channel.
AM stands for
Amplitude modulation
This type of multiplexing is used for cable television.
Frequency Division
__________ is used to combine muliple signals on a single communication circuit.
Multiplexing
FM stands for
Frequency modulation
PM stands for
phase modulation
If the entire spectrum supported by a medium is used to transmit one signal the system is using ____________ transmission.
baseband
Systems that can transmit both directions are called __________ systems.
full-duplex
Name some advantages of Digital Transmissions over analog.
1)greater bandwidth
2)better encryption
3)lower error rates
more easily updated
__________ is the number of discrete signals that can occur in a unit of time.
Baud rate
_____________ represents binary values as diffrent fequencies.
Frequency-shift keying (FSK)
_____ is more noise resistent and efficient than ASK and FSK
Phase-shift keying (PSK)
Pulse-code modulation is?
a technique for converting voice analog into digital form for transmission.
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.
Manchester
Is octet the same as a byte?
No