Confusion in Differential Manchester Encoding

Question

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?

Comments

the comma is the tag separator here, so please do not add tags like this.

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I don't know what is happened . I dragged  and dropped tag .
Take care this in future.

Answer 1

I think this helps u.

Comments

0 is represented by 

1 is represented by

So I draw two encoding scheme.

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buddy i want to know why there is two different ones for this?

and 0 has two representation and similarly for 1

can u explain how are u drawing the digital signal in above ones and in which condition we should use which one?

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in differential manchester encoding  if next bit same as current bit we will not invert .

if it is different then we will invert the waveform.

Answer 2

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

Comments

In IEEE standard  '1' is represented by low-to-high and '0' represented by high-to-low .

And according to G.E. Thomas' convention   '1' by high-to-low transition     and   '0' is expressed by a low-to-high transition .

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sir what about the integral manchester encoding . is it same in Mr. Thomas and IEEE format?

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@hem chandra

Read that gate question link , read 2 answers and all comments, i assure your all doubts related to differential Manchester will get cleared. 

and there is no term as Integral Manchester, It was just put there in question to confuse students.

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There is no such topic and term like Integral Manchester encoding  . They put this into Gate question to confuse students.

For understanding differential manchester encoding see this thread and clealrly understand 2 given diagrams :

https://electronics.stackexchange.com/questions/142453/differential-manchester-encoding