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DIN ETS 300304
Transmission and Multiplexing (TM) - Synchronous Digital Hierarchy (SDH) - SDH information model for the Network Element (NE) view; English version ETS 300304:1997
Edition
1997-12
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 3993-1
Geometrical design of cylindrical internal involute gear pairs; Basic rules
Edition
1981-08