Teknik Encoding data digital, sinyal digital:

Nonreturn-to-Zero-Level (NRZ-L)
0= high level
1= low level

Nonreturn to Zero Inverted (NRZI)
0= no transition at beginning of interval
1= transition at beginning of interval

Bipolar-AMI
0= no line signal
1= positive or negative level, alternating for suucesseive ones

Pseudoternary

0= positive or negative level, alternating for suucesseive zero
1= no line signal

Manchester
0= transition from high to low in middle of interval
1= transition from low to high in middle of interval

Differential Manchester
Always a transition in middle of interval
0= transition at beginning of interval
1= no transition at beginning of interval

B8ZS
S ame as bipolar AMI, except that any string of eight zeros is replaced by string with two code violations

HDB3
Same as bipolar AMI, except that any string of four zeros is replaced by string with one code violations