From: Clifton L. Stewart (cliftonlstewart@xxxxxxxx)
Date: Sat Dec 18 1999 - 21:32:00 GMT-3
Khurram Khani,
The 4B/5B code is a binary block code used by both the FDDI and 100
BASE-TX physical layers. In 100 BASE-TX, 4bits of data are encoded into
5 bits and transmitted at 125 Mb/s yielding an effective data rate of
100 Mb/s.
http://www.itprc.com/training.htm
*This is actually a CCIE Written type question, but I've been where you
are at, believe me sometime this information is difficult to find. Good
luck with your studies.
Cliff Stewart-CCNA, CCIE Candidate
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