3.6. Monitoring and control systems
A subsection of Computer Science, 9608, through 3. Advanced Theory
Listing 10 of 11 questions
The string of characters, “BINARY CODE”, was transmitted using 11 bytes of data. An additional byte, called the parity byte, was also transmitted. Parity bytes can be used to identify exactly which bit has been transmitted incorrectly. The table shows bit patterns for all 12 bytes after transmission. Even parity was used and the first bit is the parity bit. character bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 bit 8 byte 1 B byte 2 I byte 3 N byte 4 A byte 5 R byte 6 Y byte 7 byte 8 C byte 9 O byte 10 D byte 11 E parity byte There is one error in the transmission. Indicate the byte number and bit number of the bit which has been incorrectly transmitted. Byte number Bit number Explain your answer to part . Verification and validation can be applied during data entry. Describe what is meant by these terms. For each method, explain why it is needed. Verification Validation
9608_w15_qp_12
THEORY
2015
Paper 1, Variant 2
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Questions Discovered
11