High to Low Means Logical One | Generated by AI
Question: In Manchester encoding, a level transition occurs in the middle of each bit duration. What does a transition from high level to low level represent?
Answer:
Based on the provided reference answer, a transition from high level to low level represents a logical 1.
Comprehensive Explanation
Manchester Encoding is a synchronous clock encoding technique used by the physical layer of the Open System Interconnection (OSI) model to encode clock and data of a synchronous bit stream. In this encoding scheme, each bit period is divided into two halves, and a voltage transition occurs in the middle of each bit duration.
Conventions and Ambiguity: It is important to note that there are two common conventions for defining the logic levels in Manchester encoding, which often leads to confusion:
- G.E. Thomas Convention:
- High-to-Low transition: Represents logical 1.
- Low-to-High transition: Represents logical 0.
- IEEE 802.3 (Ethernet) Convention:
- Low-to-High transition: Represents logical 1.
- High-to-Low transition: Represents logical 0.
Context for This Question: Since the provided reference answer is 1, this specific question adheres to the G.E. Thomas convention. Therefore, within the context of this exam problem, a transition from high电平 (high level) to low电平 (low level) in the middle of the bit duration signifies a binary 1.
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