circular connector feature: 1.the ideal choice for safety and high performance internet. 2.special design for buiding and campus internet. 3.with knock-down cable frame in the back. 4.the main optical fiber and jumping wire proceed in two separated zone with cable management and safety equipment inside. 5.with circle cable the adapter fitted is as same as the framework. Description of fibre adapter 1: It is ideal choices for networks of high safety or functions 2:Equipped with cable that can be replaced and connected the shelf slowly in the back 3: The inside is equipped with the cable and management ring and safety devices 4:The adaptor bar is the same as adaptor bar and the right of frame type distribution box 5:Design for the building or campus network backbone specially 6:Optic fiber of backbone of fiber end and bridle wire can be separated in the locked section. 7. Fibre adapter is the interface to connect fiber 8. More even insertion force, better connection performance, not easy to oxidize 9. Application fields: joint point of fibre distribution frames and any fiber.