Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1975-12-10
1977-02-01
Safourek, Benedict V.
Telegraphy
Systems
Line-clearing and circuit maintenance
250199, 340347DD, H04L 700
Patent
active
040063046
ABSTRACT:
An optical communication system is disclosed in which a bipolar signal of the type transmitted in digital transmission systems is converted into a unipolar binary signal for transmission over an optical transmission medium. The three levels of the bipolar signal are converted into three pairs of bits in the binary signal. One pair of bits is not utilized in the conversion and is therefore labeled as a forbidden word. Synchronization is achieved at the receiving location for the purpose of decoding by detecting the presence of the forbidden word in the binary signal and in response to this detection an energizing pulse is produced. This energizing pulse drives a clock circuit which in turn drives a decoding apparatus utilized to translate the binary signal back into the bipolar signal. As a result of this type of word synchronization, individual errors introduced into the binary signal do not result in a framing error.
REFERENCES:
patent: 3648237 (1972-03-01), Frey, Jr. et al.
patent: 3903504 (1975-12-01), Rogers et al.
patent: 3927401 (1975-12-01), McIntosh
Conference Record, vol. II International Conference on Communication, San Francisco, June 16-18, 1975 "Line Coding Plans for Fiber Optic Communication Systems, Y. Takasaki et al., pp. 32-20 - 32-24.
Proc. of the IEEE July, 1975, Line Coding Plan for Fiber Optic Communication Systems, Y. Takasaki et al., pp. 1081-1082.
Bell Telephone Laboratories Incorporated
Dubosky Daniel D.
Safourek Benedict V.
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