Data Link
Data link
Error correction mechanisms are techniques used in computer systems to detect and correct errors that may occur during data transmission or storage. These mechanisms typically involve adding redundant bits to the data to enable error detection and correction. Common error correction techniques include parity checks, checksums, and cyclic redundancy checks (CRC).
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Parity errors occur when the parity bit, which is used for error detection in data transmission, does not match the expected value. Parity bits can be either even or odd, depending on the system's configuration, and are added to data to ensure that the total number of set bits (1s) is either even or odd. If a parity error is detected, it typically indicates that one or more bits have been altered during transmission, prompting the need for error correction or retransmission of the data.
To represent a single EBCDIC character, typically 8 bits are required. However, to ensure error detection and correction, additional parity bits known as Hamming bits are added. In the case of a single EBCDIC character, typically 4 Hamming bits are added, resulting in a total of 12 bits to represent the character. These Hamming bits help detect and correct errors that may occur during transmission or storage of the data.
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what is parallel transmission typically used for?
Bit errors are typically handled through error detection and correction techniques. Error detection methods, such as checksums or cyclic redundancy checks (CRC), identify errors in transmitted data, while error correction methods, like Hamming code or Reed-Solomon coding, allow the system to not only detect but also correct the errors without needing retransmission. In networking, protocols like Automatic Repeat reQuest (ARQ) can request retransmission of corrupted data. Together, these methods ensure data integrity and reliability in communication systems.
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Analog transmission offers advantages such as simplicity and ease of implementation, making it suitable for basic communication systems. It typically requires less bandwidth than digital transmission, allowing for efficient use of available frequencies. However, its disadvantages include susceptibility to noise and distortion, which can degrade signal quality over long distances. Additionally, analog systems lack the error correction capabilities and data compression efficiencies inherent in digital transmission, limiting their overall performance and reliability.