DS EN 3733-104:2008 Aerospace Series - Connector, Optical, Circular, Single Channel, Coupled By Self-Locking Ring, Operating Temperature Up To 150 Degrees C Continuous - Part 104: Receptacle Connector Dummy Four Holes Fixing - Product Standard Defines the characteristics of receptacle connector dummy four holes fixing for single channel fibre optic plug connectors, operating temperature up to 150 degrees C.