Margin

In telecommunication, the term margin has the following meanings:

1. In communications systems, the maximum degree of signal distortion that can be tolerated without affecting the restitution[?], i.e., without its being interpreted incorrectly by the decision circuit[?].

2. The allowable error rate, deviation from normal, or degradation of the performance of, a system or device.</b>

Source: from Federal Standard 1037C

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See also: profit margin[?]