A question about High Density Bipolar- 3 Zeros

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The discussion revolves around the confusion regarding the application of High Density Bipolar Scrambling (HDBS) in a specific signal representation. The user questions why a sequence of zeros is represented as "000-" instead of the expected "+00+" after a negative pulse, particularly noting that this occurs at the beginning of the second signal in the provided image. The user highlights that the rules dictate a sequence of 8 zeros should follow an even number of ones and a negative pulse, yet the observed pattern suggests an odd number of zeros. The inquiry seeks clarification on the rationale behind this substitution method and whether the absence of a substitution indicates an odd number of zeros. The discussion emphasizes the need for understanding the rules of HDBS and their application in signal encoding.
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Hey guys. Good night to everybody. I'm just trying to understand why the substitution in this picture was made like this(High density bipolar scrambling) of zeros:
upload_2017-6-6_22-16-24.png

The rules state that the sequence of 8 zeros that go after a negative pulse and an even number of ones since the last substitution must be: +00+ and what's being done instead at the beginning of the second signal is 000- which corresponds to an odd number of zeros and a negative pulse before the sequence of 8 zeros. This is happening at the beggining of the signal at the bottom of the picture. This also happens in practically all pictures I've seen.
Could anybody tell me why is this done?
Thanks a lot!
I'm sorry if this was the wrong forum to post this.
 
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I mean, there are two ones before the sequence of zeros. What´s going on? Does not having a substitution mean that the number of zeros is odd?
 
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