5.5 - Information Coding Systems Flashcards
What is meant by a character code?
A decimal digit used to represent a character.
For what does ASCII stand?
American Standard Code for Information Interchange.
How many bits does ASCII use?
7
What is the primary disadvantage of majority voting?
The volume of data being transmitted is increased, increasing the time taken to transmit data.
Which uses more bits, ASCII or Unicode?
Unicode
01 101011 is to be transmitted using odd parity. What would be the value of the parity bit?
0
Which can represent a greater variety of alphabets, ASCII or Unicode?
Unicode
Which form of error checking can also correct errors in transmission?
Majority voting
10 1 1 is to be transmitted using even parity. What would be the value of the parity bit?
1
What happens if a checksum does not match the received data?
The recipient asks the sender to retransmit the data.
How does even parity work ?
The value of the parity bit is chosen so as to make the total number of 1s in the transmitted data even
How does odd parity work ?
Adds a parity bit so that the total
number of 1s in the transmitted data is odd.
How does majority voting work ?
each bit of the data is transmitted multiple times. The most commonly occurring value is taken to be correct.
`How do checksums work ?
Adding a value, determined by the data itself, to the
transmitted data.
How do check digits work ?
A type of checksum in which only a single digit is added to the transmitted data
