William,
4B/5B is a coding scheme that maps 16 possible 4B data
nibble values to
a subset of the 5B binary code groups available. It was used with FDDI to
avoid
consecutive zero's that may occur in data, i.e. FDDI doesn't transmit 4 bit
ASCII data
nibbles, instead it transmits 5 bit symbols. This coding scheme was latter
used in the
100BASE-X PHY's. If you are looking for additional info The FDDI Handbook
(Raj Jain) is
a great reference.
Shawn
William Wong wrote:
> Dear all
>
> I couldn't find any information on this. Can you guys tell me what is
this?
>
> Thanks.
>
> William
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