Discussion
Why is the frame alignment pattern chosen to be unlikely in traffic?
Answer: D
The pattern must be distinctive enough that a run of traffic bits does not imitate it and pull the receiver out of alignment, which is why standard patterns look nothing like speech samples. Brevity, error tolerance and circuit simplicity are all secondary considerations that a good pattern also satisfies. A marker that has to be found in a stream must be improbable in that stream, which is a requirement common to every framing and synchronisation scheme.
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