Does the term pair gain refer to a device that connects an optical line with a line that uses electrical signaling?

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Quizplus · Accepted Answer

Pair gain refers to a telecommunications term for a system that allows multiple telephone or data connections to be made over a limited number of wires or pairs, typically using electrical signaling, not specifically to a device connecting optical lines with electrical signaling lines.

Does the Term Pair Gain Refer to a Device That