Discussion
A remote terminal must respond to a command within 12 microseconds. At 1 megabit per second this is
Answer: B
Correct answer: 12 bit times
At 1 Mbit/s each bit occupies exactly one microsecond, so the conversion is immediate:
\[ 12\ \mathrm{\mu s} = 12\ \text{bit times} \]
The response time limit exists because MIL-STD-1553 is a scheduled bus: the controller must know when a terminal has failed to answer so that it can move on or retry, and the timeout has to be short enough not to disturb the schedule. Bit times are the natural unit, being independent of any particular clock.
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