Talk:4B3T

This is the talk page for discussing improvements to the 4B3T article.
This is not a forum for general discussion of the article's subject.

Article policies

Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL

Computing: Networking Low‑importance

	This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing articles
Low	This article has been rated as Low-importance on the project's importance scale.
	This article is supported by Networking task force (assessed as Low-importance).

	Telecommunication portal This article is within the scope of WikiProject Telecommunications, a collaborative effort to improve the coverage of Telecommunications on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.TelecommunicationsWikipedia:WikiProject TelecommunicationsTemplate:WikiProject TelecommunicationsTelecommunications articles
Low	This article has been rated as Low-importance on the project's importance scale.

A non-vio version is available on the temp page. — Lomn | Talk 06:41:52, 2005-08-19 (UTC)

Original 4b3t code

Latest comment: 16 years ago1 comment1 person in discussion

The one documented is the ISDN variant, which has a lower DC disparity bound of ±1.5. The original one allowed the DC to get to ±3:

Original 4b3t code
Input	Negative	Positive	Disparity
0000	+ 0 −		0
0001	− + 0		0
0010	0 − +		0
0011	+ − 0		0
0100	− − 0	+ + 0	±2
0101	0 − −	0 + +	±2
0110	− 0 −	+ 0 +	±2
0111	− − −	+ + +	±3
1000	− − +	+ + −	±1
1001	+ − −	− + +	±1
1010	− + −	+ − +	±1
1011	− 0 0	+ 0 0	±1
1100	0 − 0	0 + 0	±1
1101	0 0 −	0 0 +	±1
1110	0 + −		0
1111	− 0 +		0

A. Croisier (1970), "Introduction to Pseudoternary Transmission Codes", IBM Journal of Research and Development, 14 (4): 354–367