Computer Communication Chapter 6

What is the purpose of an error correction code?

To map k-bit input onto an n-bit codeword (correct)
To reduce the number of stations on a medium
To reduce the possibility of error detection
To increase the effective data rate

What type of configuration topology involves only two stations?

Half duplex
Full duplex
Multipoint
Point-to-point (correct)

What is the main difference between half duplex and full duplex?

Error detection method
Type of transmission
Number of stations
Number of data paths (correct)

What is the purpose of a full duplex configuration?

To allow simultaneous transmission and reception (A) Signup and view all the answers

What type of transmission is characterized by alternate transmission and reception?

Half duplex (B) Signup and view all the answers

What is the benefit of using a line configuration?

Efficient use of resources (C) Signup and view all the answers

What is the term for the physical arrangement of stations on a medium?

Line configuration topology (A) Signup and view all the answers

What is the term for a traditional mainframe computer and terminals setup?

Multipoint topology (C) Signup and view all the answers

What is the purpose of error detection and correction?

To detect and correct errors in transmission (C) Signup and view all the answers

What is the term for the classification of data exchange?

Duplex (C) Signup and view all the answers

What is a key characteristic of asynchronous transmission?

Adds 2-3 bits of overhead per character (A) Signup and view all the answers

What type of error occurs when a contiguous sequence of bits is altered?

Burst error (D) Signup and view all the answers

What is the purpose of a preamble and postamble in synchronous transmission?

To indicate the start and end of a block of data (C) Signup and view all the answers

What is the primary disadvantage of asynchronous transmission?

Higher overhead compared to synchronous transmission (B) Signup and view all the answers

What is the purpose of error detection codes?

To detect errors in transmission (A) Signup and view all the answers

What is a key advantage of synchronous transmission?

Lower overhead compared to asynchronous transmission (B) Signup and view all the answers

What is the purpose of the frame check sequence (FCS) in cyclic redundancy check (CRC) error detection?

To generate a checksum for error detection (C) Signup and view all the answers

What is a limitation of error correction in wireless applications?

High bit error rate causing retransmissions (A) Signup and view all the answers

What is the primary advantage of error correction over error detection?

Ability to correct errors without retransmission (A) Signup and view all the answers

What is the purpose of parity bits in asynchronous transmission?

To detect errors in transmission (D) Signup and view all the answers

What is a key advantage of differential encoding?

It is more reliable in detecting transitions than levels (B) Signup and view all the answers

What is a characteristic of Manchester encoding?

A transition in the middle of each bit period (C) Signup and view all the answers

What is a limitation of multilevel binary encoding?

It can lose synchronization with long runs of zeros or ones (C) Signup and view all the answers

What is a key benefit of bipolar-AMI encoding?

It has no loss of synchronization with long strings of ones (A) Signup and view all the answers

What is a key difference between bipolar-AMI and pseudoternary encoding?

Pseudoternary uses no line signal for zero while bipolar-AMI uses a pulse (A) Signup and view all the answers

What is a key characteristic of scrambling in data transmission?

It is used to prevent long runs of zeros or ones (C) Signup and view all the answers

What is a key benefit of multilevel binary encoding?

It can represent more than one bit of data per signal element (D) Signup and view all the answers

What is a key limitation of non-return-to-zero encoding?

It can lose synchronization with long runs of zeros or ones (A) Signup and view all the answers

What is a key difference between Manchester and differential encoding?

Differential encoding uses transitions while Manchester encoding uses levels (D) Signup and view all the answers

What is a key benefit of using bipolar-AMI encoding?

It has lower bandwidth and easy error detection (C) Signup and view all the answers

What is the primary characteristic of a digital signal?

Discrete, discontinuous voltage pulses (C) Signup and view all the answers

What is the term used to describe the rate of data transmission in bits per second?

Data rate (C) Signup and view all the answers

What is the primary factor that affects signal interpretation in digital signaling?

Signal to noise ratio (C) Signup and view all the answers

What is the term used to describe the rate at which the signal level changes, measured in baud?

Modulation rate (A) Signup and view all the answers

What is the primary characteristic of unipolar encoding?

All signal elements have the same sign (A) Signup and view all the answers

What is the primary purpose of clocking in digital signaling?

To determine the timing of bits (D) Signup and view all the answers

What is the term used to describe the duration of a bit in digital signaling?

Time taken for the transmitter to emit the bit (D) Signup and view all the answers

What is the primary characteristic of Nonreturn to Zero-Level (NRZ-L) encoding?

Voltage remains constant during bit interval (B) Signup and view all the answers

What is the term used to describe binary 1 and binary 0 respectively?

Mark and space (A) Signup and view all the answers

What is the primary factor that determines the modulation rate in digital signaling?

Type of digital encoding used (A) Signup and view all the answers

What is the primary purpose of scrambling in digital transmission?

To replace sequences that would produce constant voltage (B) Signup and view all the answers

What is unique about Differential Manchester Encoding?

It uses a midbit transition to clock only the start of the bit period (D) Signup and view all the answers

What is the main advantage of B8ZS encoding?

It reduces the DC component (C) Signup and view all the answers

What is the primary characteristic of Amplitude Shift Keying (ASK)?

It represents 0 and 1 by different amplitudes (D) Signup and view all the answers

What is the main disadvantage of Amplitude Shift Keying (ASK)?

It is inefficient and prone to sudden gain changes (D) Signup and view all the answers

What is the primary characteristic of Binary Frequency Shift Keying (BFSK)?

It represents 0 and 1 by different frequencies (D) Signup and view all the answers

What is an advantage of using Multiple FSK?

It is more bandwidth efficient (B) Signup and view all the answers

What is the primary characteristic of Phase Shift Keying (PSK)?

It represents 0 and 1 by different phases (A) Signup and view all the answers

What is the primary advantage of Differential PSK?

It shifts the phase relative to the previous transmission (D) Signup and view all the answers

What is the primary application of Modulation Techniques in telecommunications?

Public telephone systems and high-speed data transmission (C) Signup and view all the answers