Discussion
Why is a link's fade margin not a defence against a permanent obstruction?
Answer: B
A margin is calculated so that time varying fades exceed it only for the permitted outage period, and a constant loss simply reduces the whole budget, leaving less to absorb those fades. The correct treatment is to include the obstruction as a fixed loss and recompute the margin. Frequency, seasonal applicability and alignment are unrelated. Distinguishing a constant term from a statistical one determines where in a budget it belongs and how it must be covered.
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