Question 19B2

Digital Selective Calling (DSC) transmissions employ a robust Forward Error Correction (FEC) scheme to ensure reliable communication, especially in noisy marine environments. The specific method used is a (10,7) code. This means that for every 7 bits of actual information, 3 redundant bits are added. These 3 extra bits are used by the receiving station to detect and correct single-bit errors within each 10-bit symbol. This integral error correction dramatically increases the probability of successful message reception, which is critical for safety-related communications. Options A, B, and C are incorrect because they misrepresent the bit length or the specific mechanism of error handling in DSC, which fundamentally relies on this 10-bit symbol with its embedded error correction.