What is another name for a system + system UPS configuration?

Question

Options

• AN
• BN+1
• CN+2
• D2N

• A
  2% (1)
• B
  7% (3)
• C
  17% (7)
• D
  74% (31)

Explanation

A "system + system" configuration means you have two complete, fully redundant UPS systems running in parallel - one primary and one mirrored backup - which is exactly what 2N describes: double the capacity required. Option A (N) is wrong because it represents only the minimum capacity needed with no redundancy whatsoever. Option B (N+1) is wrong because it adds just one extra unit beyond the minimum, providing partial redundancy rather than a full duplicate system. Option C (N+2) is wrong because it adds two extra units, which is more than N+1 but still not a fully mirrored system.

Memory tip: Read "system + system" as an equation - one system plus one system equals two systems, which maps directly to 2N (two times the base requirement). If you see a plus sign connecting two equal things, think 2N.

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