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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