Discussion
Match each role in List I with its behaviour in List II.
List I
A. Bus controller
B. Remote terminal
C. Bus monitor
D. Backup bus controller
List II
1. Directs every transfer on the bus
2. Transmits only in response to a command
3. Listens to all traffic and never transmits
4. Takes over if the active controller fails
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
The four roles are distinguished by what each may put on the bus. The bus controller directs every transfer; a remote terminal transmits only when commanded; a bus monitor transmits nothing at all.
The backup bus controller is the one that can assume the directing role if the active controller fails - a capability the monitor deliberately lacks, since its passivity is what makes it safe to connect during a test flight without altering the system's behaviour.
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