GeneralG8C04
Which of the following describes Baudot code?
C
Answer
Signals and emissions
Type
A
A 7-bit code with start, stop, and parity bits
B
A code using error detection and correction
C
A 5-bit code with additional start and stop bits
D
A code using SELCAL and LISTEN
Answer Notes
Baudot code is one of the earliest digital character sets used in telecommunications, famously employed in traditional amateur radioteletype (RTTY). It uses a 5-bit character set, which only allows for a total of 32 possible combinations (2 to the 5th power).
Because 32 combinations are not enough to represent the full English alphabet, all numbers, and punctuation, Baudot relies on special "Letters" and "Figures" shift characters to swap between two entirely different character banks. It does not contain any built-in error detection or correction parity bits.
In asynchronous transmission, these 5 data bits are framed by an additional start bit and a stop bit to keep the sending and receiving machines mechanically or electronically synchronized. The 7-bit code mentioned in the distractors describes standard ASCII, not Baudot.
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In an ARQ mode, what is meant by a NAK response to a transmitted packet?