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As I understand from references :-

start with positive site

but  1 means high to low

and 0 means low to high  

low is 0 and high is 1

and when there is found of 0 inverse the next bits.

is it right?
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2 Answers

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I think this helps u.

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See, there are 2 standards .

Forouzan  along with  William stallings book follow IEEE standards . Where Tanenbaum book follows G. E. Thomas standard .

It is just the convention which determine the correct answer.

 see this from IIT KGP, they follow IEEE standard - http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Computer%20networks/pdf/M2L4.pdf

 and this one from IITB , they follow G E Thomas version -- 

https://www.cse.iitb.ac.in/synerg/lib/exe/fetch.php?media=public:courses:cs348-spring08:slides:topic03-phy-encoding.pdf

and we generally follow IEEE standards.

see this gate question https://gateoverflow.in/3505/gate2007-it-61

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