H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/1
H04L 25/49 (2006.01) H04B 17/02 (2006.01)
Patent
CA 1249027
ABSTRACT OF THE DISCLOSURE In accordance with the invention there is provided a method for transmitting information items via a digital auxiliary channel in an optical wave guide system for a digital signal transmission, in which system electrical signals, which are coded in a pseudoternary bipolar code, are converted into a data stream formed by a redundant, binary line and are transmitted in converted form by an optical trans- mitter via an optical wave guide to an optical receiver. In each case, one information unit of the information items is transmitted by modification of a selected bit pattern from the data stream thereby to establish a digital auxiliary channel. The method includes the steps of selecting an HDB-3 code for use as a pseudoternary bipolar code and using an MCMI code as the line code. Bit sequences 110011 and 001100 are used as selected bit patterns. At least one of the bit sequences 011011, 100111 and 101101 are allocated as a first modification to the bit sequence 110011. At least one of the bit sequences 001001, 000110 and 010010 are allocated as a second modification to the bit sequence 001100. A binary "1" of the information items is transmitted by means of one of the two modifications and a binary "0" of the information items is transmitted by means of the other of the two modifications.
491190
Bbc Brown Boveri & Company Limited
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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