Discussion
What is the function of a signalling slot in a multiplex frame?
Answer: C
A signalling slot carries the control information a call needs - dialling, answer, clear - separately from the speech itself, which is why the European primary rate has thirty-two slots for thirty channels. Slot boundaries come from the frame alignment pattern in the other overhead slot, guard time is unallocated margin rather than a slot, and amplitude equalisation is not a framing matter. Overhead in a frame is always doing a job, and identifying which job each slot does explains why the numbers come out as they do.
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