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DIN ETS 300746
Transmission and Multiplexing (TM) - Synchronous Digital Hierarchy (SDH) Network protection schemes - Automatic Protection Switch; APS protocols and operation; English version ETS 300746:1997
Edition
1997-12
DIN ETS 300233
Integrated Services Digital Network (ISDN) - Access digital section for ISDN primary rate; English version ETS 300233:1994
Edition
1994-10
