Apparatus and method for encoding data in a fiber data distribut

Details Apparatus and method for encoding data in a fiber data distribut Apparatus and method for encoding data in a fiber data distribut

1994-09-30

1997-08-05

Harrell, Robert B.

Pulse or digital communications

Transmitters

375254, 341 50, G06F 1100

Patent

active

056550782

ABSTRACT:
A fiber data distributed interface (FDDI) system uses an MLT3A encoding scheme in order to reduce DC bias or baseline wander. The MLT3A encoding scheme is a scheme wherein logical zeros are transmitted as ground voltages and logical ones are transmitted as one of either positive voltages or negative voltages depending upon past transmission history (FIG. 4 ) wherein the past history is recorded by a counter C or an analog circuit. MLT3A ensures that the baseline wander or DC bias returns to zero or is maintained as close to zero as possible in a timely manner so that no FDDI systems will fail from baseline wander.

REFERENCES:
patent: 5200979 (1993-04-01), Harris
patent: 5319680 (1994-06-01), Port et al.
patent: 5465272 (1995-11-01), Smith

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