A) An STS multiplier
B) A regenerator
C) An add/drop multipliers
D) A repeater
E) None of these
Correct Answer: C
Solution :
An add/drop multiplexer can add signals coming from different sources in to a given path or remove a desired signal from a path and redirect it without de-multiplexing the entire signal. Instead of relying oil liming and bit positions, add/drop multiplexers use header information such as addresses and pointer to identify individual streams,
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