Optical fibers is connected by adapter through the interior of the opening sleeve; Conversion adapter can be connected to different types of fiber jumper Interface, and to provide a connection between the APC end face; Double or even mounting density can be increased; Insertion Loss: <=2.0dB; Repeatability: <=0.1dB; Interchangeability: <=0.2dB; Working temperature: -40'C~80'C; Storage temperature: -40'C~85'C; Industrial standard: Bellcore TA-NWT-001209