DS EN 50377-13-3:2011 Connector Sets And Interconnect Components To Be Used In Optical Fibre Communication Systems - Product Specifications - Part 13-3: Type Lx.5-Apc Duplex Terminated On Iec 60793-2-50 Category B1.1 And B1.3 Singlemode Fibre, With Full Zirconia Ferrule Category U Defines the initial, start of life dimensional, optical, mechanical and environmental performance requirements which a terminated and assembled singlemode resilient alignment sleeve LX.5 APC connector