Exam 6: Error Detection and Correction

Three approaches are in common use for coping with data transmission errors: error-detection codes,error-correction codes,and __________ protocols.

Redundant bits are not used by the receiver for error detection.

In ________ transmission systems,an error occurs when a bit is altered between transmission and reception.

The ________ is a measure of how much additional bandwidth is required to carry data at the same data rate as without the code.

A ___________ is an isolated error condition that alters one bit but does not affect nearby bits.

Error correction works by adding sufficient redundancy to the transmitted message.

Burst errors can be caused by impulse noise.

The simplest error detecting scheme is to append a parity bit to the end of a block of data.

CRC-32 is not used in IEEE 802 LAN standards.

A ________ error is an isolated error condition that alters one bit but does not affect nearby bits.

An error detection code simply detects the presence of an error. .

In an ??????__________ ,there is a cluster of bits in which a number of errors occur,although not necessarily all of the bits in the cluster suffer an error.

The __________ is a measure of how much additional bandwidth is required to carry data at the same data rate as without the code.

Correction of errors using an error detecting code requires that block of data to be ________.

A ________ error can occur in the presence of white noise when a slight random deterioration of the signal to noise ratio is sufficient to confuse the receiver's decision of a single bit.

The _________ is a string of 1-bit storage devices with each device having an output line,which indicates the value currently stored,and an input line.

The __________ is the reduction,in decibels,to achieve a specified BER of an error-correcting coded system compared to an uncoded system using the same modulation.

Error detection found in data link control protocols such as HDLC is not a useful technique.

The __________ d(v1 ,v2)between two n -bit binary sequences v1 and v2 is the number of bits in which v1 and v2 disagree.

The characteristics that distinguish various data link configurations are topology and whether the link is half duplex or full duplex.