50 Questions
What is the purpose of an error correction code?
To map k-bit input onto an n-bit codeword
What type of configuration topology involves only two stations?
Point-to-point
What is the main difference between half duplex and full duplex?
Number of data paths
What is the purpose of a full duplex configuration?
To allow simultaneous transmission and reception
What type of transmission is characterized by alternate transmission and reception?
Half duplex
What is the benefit of using a line configuration?
Efficient use of resources
What is the term for the physical arrangement of stations on a medium?
Line configuration topology
What is the term for a traditional mainframe computer and terminals setup?
Multipoint topology
What is the purpose of error detection and correction?
To detect and correct errors in transmission
What is the term for the classification of data exchange?
Duplex
What is a key characteristic of asynchronous transmission?
Adds 2-3 bits of overhead per character
What type of error occurs when a contiguous sequence of bits is altered?
Burst error
What is the purpose of a preamble and postamble in synchronous transmission?
To indicate the start and end of a block of data
What is the primary disadvantage of asynchronous transmission?
Higher overhead compared to synchronous transmission
What is the purpose of error detection codes?
To detect errors in transmission
What is a key advantage of synchronous transmission?
Lower overhead compared to asynchronous transmission
What is the purpose of the frame check sequence (FCS) in cyclic redundancy check (CRC) error detection?
To generate a checksum for error detection
What is a limitation of error correction in wireless applications?
High bit error rate causing retransmissions
What is the primary advantage of error correction over error detection?
Ability to correct errors without retransmission
What is the purpose of parity bits in asynchronous transmission?
To detect errors in transmission
What is a key advantage of differential encoding?
It is more reliable in detecting transitions than levels
What is a characteristic of Manchester encoding?
A transition in the middle of each bit period
What is a limitation of multilevel binary encoding?
It can lose synchronization with long runs of zeros or ones
What is a key benefit of bipolar-AMI encoding?
It has no loss of synchronization with long strings of ones
What is a key difference between bipolar-AMI and pseudoternary encoding?
Pseudoternary uses no line signal for zero while bipolar-AMI uses a pulse
What is a key characteristic of scrambling in data transmission?
It is used to prevent long runs of zeros or ones
What is a key benefit of multilevel binary encoding?
It can represent more than one bit of data per signal element
What is a key limitation of non-return-to-zero encoding?
It can lose synchronization with long runs of zeros or ones
What is a key difference between Manchester and differential encoding?
Differential encoding uses transitions while Manchester encoding uses levels
What is a key benefit of using bipolar-AMI encoding?
It has lower bandwidth and easy error detection
What is the primary characteristic of a digital signal?
Discrete, discontinuous voltage pulses
What is the term used to describe the rate of data transmission in bits per second?
Data rate
What is the primary factor that affects signal interpretation in digital signaling?
Signal to noise ratio
What is the term used to describe the rate at which the signal level changes, measured in baud?
Modulation rate
What is the primary characteristic of unipolar encoding?
All signal elements have the same sign
What is the primary purpose of clocking in digital signaling?
To determine the timing of bits
What is the term used to describe the duration of a bit in digital signaling?
Time taken for the transmitter to emit the bit
What is the primary characteristic of Nonreturn to Zero-Level (NRZ-L) encoding?
Voltage remains constant during bit interval
What is the term used to describe binary 1 and binary 0 respectively?
Mark and space
What is the primary factor that determines the modulation rate in digital signaling?
Type of digital encoding used
What is the primary purpose of scrambling in digital transmission?
To replace sequences that would produce constant voltage
What is unique about Differential Manchester Encoding?
It uses a midbit transition to clock only the start of the bit period
What is the main advantage of B8ZS encoding?
It reduces the DC component
What is the primary characteristic of Amplitude Shift Keying (ASK)?
It represents 0 and 1 by different amplitudes
What is the main disadvantage of Amplitude Shift Keying (ASK)?
It is inefficient and prone to sudden gain changes
What is the primary characteristic of Binary Frequency Shift Keying (BFSK)?
It represents 0 and 1 by different frequencies
What is an advantage of using Multiple FSK?
It is more bandwidth efficient
What is the primary characteristic of Phase Shift Keying (PSK)?
It represents 0 and 1 by different phases
What is the primary advantage of Differential PSK?
It shifts the phase relative to the previous transmission
What is the primary application of Modulation Techniques in telecommunications?
Public telephone systems and high-speed data transmission
Test your understanding of digital data communication techniques, including two-way communication links and stimulus-response actions, as covered in William Stallings' 8th edition and Lawrie Brown's lecture slides.
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