| 摘要 |
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. |
