H - Electricity – 04 – J
Patent
H - Electricity
04
J
340/71, 363/10.2
H04J 3/14 (2006.01) H04B 1/74 (2006.01) H04J 3/00 (2006.01)
Patent
CA 1166773
A.K.Edwards - 3 Abstract of the Disclosure An automatic span line switch for high speed com- munication lines is disclosed. The apparatus employs an alarm interface unit which is coupled to a service line terminal in order to detect a line failure mode Upon detection of such a mode, the system operates to modify the parity bit content of the transmitted digital signal in order to provide a unique code to be transmitted to a remote office connected to a near office and indica- tive of a span line failure. The apparatus automatically proceeds to switch the failed transmission line to a back-up protection line to enable the near location to communicate with the remote location via, the back-up line. All control signals transmitted between the loca- tions are implemented by means of unique codes which are generated by purposely modifying the parity bit content in each successive frame of the transmitted digital sig- nal. The system further describes a priority system for preferentially switching higher priority service lines when multiple failures occur. Various other techniques such as manual operation are disclosed to enable manual switching of protection lines during system operation.
389740
International Standard Electric Corporation
Smart & Biggar
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