So, does this mean it should really be called 80BaseTX/FX because of the
20% overhead introduced by 4B/5B? :)
Prof. Tom Lisa, CCAI
Community College of Southern Nevada
Cisco Regional Networking Academy
Priscilla Oppenheimer wrote:
4B/5B is a signal encoding scheme. It's used in 100BaseTX
It's 25% in the other direction (125mbps).
But I'm thinking you already knew that?
DaveC
Tom Lisa wrote:
So, does this mean it should really be called 80BaseTX/FX because of the
20% overhead introduced by 4B/5B? :)
Prof. Tom Lisa, CCAI
Community College of Southern Nevada
Cisco
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
Dear all
I couldn't find any information on this. Can you guys tell me what is this?
Thanks.
William
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=2018t=2018
--
FAQ, list archives, and subscription info:
4B/5B is a signal encoding scheme. It's used in 100BaseTX and 100BaseFX
also, so it's rather important to know. I'm going to have all the gory
details in an upcoming white paper at http://www.certificationzone.com.
Here's quick preview.
100BaseFX uses Non Return to Zero, Invert on One (NRZI),
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