Encoding method in transmission of plurality of oversampled data

Details Encoding method in transmission of plurality of oversampled data Encoding method in transmission of plurality of oversampled data

1988-02-18

1989-08-22

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

371 70, 375 19, H04J 306, H04L 108, H04L 2534

Patent

active

048602868

ABSTRACT:
An encoding method in transmitting a plurality of parallel, independent and asynchronous data channels, each of which after encoding into serial from is to be supplied to an optical transmitter before transmission over a fibre-optic cable. The parallel data channels (D1-D4) are over-sampled, i.e. they are sampled several times per time slot and are time multiplexed in a series of frames (R1,R2,R3, . . . ) the channels in one frame (R1) being retained with their true values (D1-D4) and in the successive frame (R2) being given their inverted values (D1-D4). In addition there are inserted fixed synchronizing bits (F1,F2) and a bit (T1) which alternates between a logical 0 and a logical 1, depending on whether the true or inverted values of the data channels occur in the frames. A parallel-series converter for carrying out the encoding method is described.

REFERENCES:
patent: 4249266 (1981-02-01), Nakamori
patent: 4599723 (1986-07-01), Eck
patent: 4636029 (1987-01-01), Johansson et al.

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