Discussion
Assertion (A): Manchester encoding doubles the required signalling bandwidth.
Reason (R): Every bit contains a transition, giving two signal elements per bit.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the mechanism. A transition at the middle of every bit means two signal elements per bit period, so the highest fundamental frequency equals the bit rate rather than half of it.
A 1 Mbit/s Manchester link therefore needs about 1 MHz of signalling bandwidth where a non-return-to-zero code would need 500 kHz. The bandwidth buys clock recovery from the data and a DC-free signal, which is what permits the transformer coupling MIL-STD-1553 uses.
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