Error Detection Flashcards
What is the definition of error detection ?
The ability to detect errors caused by noise or their impairments during transmission
Name 4 different types of error detection ?
Repetition schemes
Parity schemes
Column parity
Row parity
Define repetition schemes?
A stream of data broken down into blocks. Each block is sent a predetermined number of times.
Define parity schemes ?
Parity error detection simply adds an extra binary digit within each block of data sent.
Name two different types of parity schemes?
Even parity scheme
Odd parity scheme
What are the disadvantages of repetition schemes ?
Inefficient
What are the advantages of parity schemes ?
Good for asynchronous transmissions
What are the disadvantages of parity schemes ?
Only detect single errors.
Only detects an odd number of errors.
What is the definition of error correction?
The ability of the receiver to construct the original data error free.
What is automatic repeat request ? ARQ
An error control method for data that uses acknowledgements with timeouts to achieve a reliable transmission over an unreliable service.
There are two types of basic design for error correcting systems, name them ?
Automatic repeat request .
Forward error correction.
What are the three types of ARQ ?
Stop and wait ARQ
Go back n ARQ
Selective repeat ARQ
Define stop and wait ARQ?
The simplest method of ARQ, where the transmit terminal sends the frames and won’t send anymore until it has an ack response from the receiver.
Disadvantages of go back N ARQ?
Waste of windows and frames as they are resent.
What is the advantages of go back N ARQ?
More efficient
Better than stop and wait
