Discussion
How does a receiver know which slot belongs to which channel?
Answer: A
A frame synchronising pattern marks the start of each frame, and the receiver counts slots from there. Distinguishing channels by amplitude or width would consume the very parameter carrying the message. And connection order is known to the equipment but useless without a timing reference. Any scheme that multiplexes by position in a sequence needs a marker for where the sequence begins, and that marker is pure overhead worth paying. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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