Usage and properties: 1) The wiring connection device used in connecting optical cables and optical communication installations 2) Used for the combination and distribution of backbone optical cables at partial ends in optical fiber access network 3) The structure of the unit is on substantiating fiber weld, protection, coil storage and assembly of adapter 4) Rapidly and expediently attempering the serial numbers of optic fibers or changing the route of optical transmission system Main technical indexes: 1) Environmental temperature: -5°C ~ +60°C 2) Relative humidity: ≤85% (+30°C) 3) Insulation resistance: ≥2 x 10,000mΩ/ 500V 4) Voltage resistance strength: under the effect of 15kV DC/1min, non-puncture, no are-over