Discussion
A label occupies 8 bits of an ARINC 429 word. The number of distinct labels available is
Answer: C
Correct answer: 256
An eight-bit field has
\[ 2^{8} = 256 \]
distinct values, so 256 labels are available. They are conventionally written in octal, from 001 to 377.
The space is not as generous as it looks, since labels are assigned by the standard so that equipment from different manufacturers agrees on their meaning. It is extended in practice by the source destination identifier bits and by equipment identifiers, which allow the same label to carry different parameters in different systems.
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