What are two reasons for physical layer protocols to use frame encoding techniques?
There are two main reasons for physical layer protocols to use frame encoding techniques:
1. Data transmission synchronization: Frame encoding techniques are used to add synchronization bits or patterns to the data being transmitted. Synchronization ensures that the sender and receiver are properly aligned and can interpret the data correctly. For example, Manchester encoding uses transitions between high and low voltage levels within each bit to enable the receiver to synchronize its clock with the sender’s clock.
2. Error detection and correction: Frame encoding techniques help in detecting and sometimes correcting errors that may occur during data transmission. By adding extra bits, such as parity bits or checksums, to the transmitted data, the receiver can perform error detection and determine if any errors have occurred during transmission. For example, in Hamming code encoding, extra parity bits are added to the data to enable the receiver to detect and correct single-bit errors.
Overall, frame encoding techniques play a crucial role in ensuring reliable and accurate data transmission at the physical layer of a network protocol. They help in synchronizing data transmission and provide mechanisms to detect and correct errors, leading to more reliable communication.
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