Chapter 3 (ITN 100)
False
Baud rate is the number of bits transmitted per second.
True
Coding schemes are groups of bits that translate into the "alphabet" of any given system.
true
Data compression can increase the throughput of a communication link.
False
Digital transmission occurs when the signal sent over the transmission media constantly varies among an infinite number of states.
False
Digital transmission produces more errors than analog transmission.
True
Ethernet, a common LAN technology, uses Manchester encoding.
False
Fiber optic cable carries signals in traditional electrical form
True
One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.
False
Propagation delay is negligible with satellite transmission.
False
Radio, microwave and satellite are all examples of guided media.
True
WDM is a version of FDM used in fiber-optic cables.
Serial
When all bits of a character are transferred one after another, the bits are transferred in ___________ mode.
16
When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______.
point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits.
Which is not true about point-to-point circuits?
fiber optic cable
Which of the following is the most secure wired media?
fiber optic cable
Which of the following media can best withstand harsh environmental conditions?
Serial transmission is slower than parallel transmission
Which of the following statements is correct?
bandwidth is constant across any wire, therefore distance is not relevant to its capacity
Which of the following statements is true?
bipolar
Which type of digital signaling would experience fewer errors because it has more distinct signals?
False
With nonreturn to zero signaling, the voltage alternates between zero and a positive or negative voltage.
Return-to-zero signaling
With which type of digital signaling does the signal always return to zero volts after each bit?
circuit configuration
_________ is the basic physical layout of the circuit.
microwave
__________ is a line-of-sight type of wireless media.
Data rate signaling
___________ is not a type of digital signaling technique.
dispersion
___________ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination.
quadrature amplitude modulation
____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.
adaptive differential pulse code modulation
____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.
modulation
____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0.
logical circuit
____________ refers to the transmission characteristics of the circuit.
quantizing error
_____________ 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.
Propagation delay
______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission).
False
A codec converts an incoming digital signal to an analog signal for transmission over an analog network.
False
A physical circuit refers to the transmission characteristics of the connection.
Shared
A(n) __________ circuit is another name for a multipoint configuration.
False
ASCII is the least popular code for data communications.
attenuation
Another term for the weakening of a signal over distance is:
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.
Full-duplex
Having a conversation with someone using a cellular phone is an example of ------transmission.
128 Kbps
If each sample uses 16 bits and the number of samples taken each second is 8000; then the transmission speed on the circuit is?
False
In a multi point circuit configuration, each computer can use the circuit at the same time.
True
In full-duplex transmission, two stations can send and receive simultaneously.
digital
In general, networks designed to transmit primarily computer data are likely to be ________.
phase modulation
In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?
is a type of high frequency radio communication, requires a clear line-of-sight path, is typically used for long distance data transmission, does not require the laying of any cable
Microwave transmission:
False
Multimode fiber is capable of longer transmission distances than single mode fiber.
False
Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.
False
Nonreturn to zero is a type of unipolar signaling
True
Statistical time division multiplexing does not require the capacity of the circuit to be equal to the sum of the combined circuits.
bandwidth
The _____________ of a circuit determines a circuit's capacity.
modulator/demodulator
The acronym, Modem, stands for _________________.
False
The cabling that runs from the telecommunications closet to each LAN is called backbone cabling.
Multi mode
The earliest type of fiber optic systems were:
True
The medium is the physical matter or substance that carries the voice or data transmission.
True
The predominant method of transferring information internally in a computer is via parallel mode.
telecommunications closet
The room that contains the cable termination points and the distribution frames is referred to as
twisted pair
The type of media usually installed on homes and businesses by the telephone company is called ____________.
20 to 14,000 Hz
The typical range of human hearing is:
True
Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.
differ widely among media
Transmission speeds: