Talk:4B3T

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

Original 4b3t code

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