it is my understanding that the 4b/5b encoding is used to translate 4 bits
into a 5 bit string, there is some table that lists exactly what get gets
translated to what each time. the whole idea behind this is to make it so
you don't have sequences with the same repeated bit pattern (4 zeros
perhaps) sent out across the network. with self-clocking schemes
(manchester, etc) you want to have a variance in signals that are sent,
otherwise one router a few hundred yards away from the sending device may
not be able to accurately tell if that was 3 or 4 zeros that was just sent.
the 4b/5b is so you can never have more than 3 low voltage bits after one
another
jon
----- Original Message -----
From: "천리안메일" <[EMAIL PROTECTED]>
To: "cisco group study" <[EMAIL PROTECTED]>
Sent: Wednesday, January 31, 2001 9:25 PM
Subject: in fddi, what is the charateristics of 4b/5b encoding?
> in fddi, what is the charateristics of 4b/5b encoding?
> cisco www show me a little information.. that 4b/5b is used in multi-mode
fiber over fddi or atm..
> and that is a encoding scheme.. and support speed up to 100Mbps..on
multimode fiber..
> I just know some more characteristics about 4b/5b enconding over fddi or
atm..
> could you give me those?
> thanks.
>
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