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Priority to JP9697684ApriorityCriticalpatent/JPS60240225A/ja
Publication of JPS60240225ApublicationCriticalpatent/JPS60240225A/ja
Publication of JPH0473647B2publicationCriticalpatent/JPH0473647B2/ja
H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus