问题描述：
英语翻译
A Simple Intensity Modulation Encoding is rejected because it does not provide synchronization; a string of 1s or 0s would have no transitions
The 4B/5B code is chosen over Manchester code because it is more efficient (80% vs.50%)
The 4B/5B code is further encoded using NRZI so that the resulting differential encoding will improve reception reliability
NRZI (NonReturn To Zero Inverted)
1:A transition at the beginning of the bit interval
0:No transition at the beginning of the bit interval
The specific codes chosen for the encoding of the 16 four-bit data patterns guarantee no more than three zeros in a row.This provides for adequate synchronization
A Simple Intensity Modulation Encoding is rejected because it does not provide synchronization; a string of 1s or 0s would have no transitions
The 4B/5B code is chosen over Manchester code because it is more efficient (80% vs.50%)
The 4B/5B code is further encoded using NRZI so that the resulting differential encoding will improve reception reliability
NRZI (NonReturn To Zero Inverted)
1:A transition at the beginning of the bit interval
0:No transition at the beginning of the bit interval
The specific codes chosen for the encoding of the 16 four-bit data patterns guarantee no more than three zeros in a row.This provides for adequate synchronization
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