raja.cedt wrote on Jan 9th, 2012, 1:28pm:hello jerry,
if you have coding like 8b/10b in transmitter, then data has some minimum transition so whats the purpose of RLL then?
Sorry jerry, i am new to this field so i am asking this kind of basic Questions.
Thanks,
Raj.
Not a problem Raj.
The 8b/10B is a RLL code.
Some form of binary data (aka NRZ data) with no restrictions (it
can have a million 0's in a row in it!) is put into an encoder,
which transforms it into an 8b/10b code structure which obeys
rules associated with min-max distance between transitions.
The RLL code is transferred in the communication medium.
Reception of the RLL code is synchronized back to a clean synchronous
set of digital transitions which is tied to the receiver's CDR system.
That data goes through a decoder, which takes the 8b/10b and
converts it bake to NRZ data.
thats the basics....