Fiber Distribution Box Assembly Requirements

　　a) Corridor (indoor, outdoor) optical fiber distribution and distribution boxes should meet the requirements of upper and lower cable entry, the top and bottom of the box should be equipped with 4 cable entry holes, and the optical cable fixing and protection device should be able to meet the requirements of 4 optical cables At the same time fixed demand. If the lower cable entry is used alone, the upper cable entry space needs to be sealed.

　　b) The optical fiber splice tray should be open, and the installation method and size of the optical cable splice tray and the leather cable splice tray should be consistent.

　　c) The connection of all fasteners should be firm and reliable, and the bonding of the sealing strip of the box should be smooth and firm.

　　d) The opening angle of the box door is not less than 180o, and the opening and closing of the door lock is flexible and reliable.

　　e) When the optical cable is introduced, its bending radius should be greater than 15 times the diameter of the optical cable.

　　f) When the optical fiber is laid out in the box, no matter where it turns, the radius of curvature should not be less than 30mm.

　　g) The minimum bending radius of the butterfly drop cable after being fixed should not be less than 10mm, and the reserved length in the box should not be less than 0.5m.

　　h) The optical splitter installed in the optical splitter box should be fixed in the box with firm materials, and the performance indicators of the optical splitter must meet the requirements of the bidding technical specification.

　　i) The optical fiber active connector used in the optical splitter should be SC type, the insertion loss of any connection between two plugs should be ≤0.5dB, and the return loss should be >35dB. Part 3: Type SC" requirements. The optical fiber active connector used by the uplink port of the optical splitter should be green, the optical fiber active connector used by the downlink port should be blue, and no optical fiber active connector should be installed on the idle port.

　　j) The terminal, splicing, and storage of the optical fibers in the corridor optical fiber distribution box shall be conveniently configured within the full capacity range.

　　j) The optical splitter should be modularized and integrated, and there should be no jumpers in the corridor splitter box.

　　l) The manufacturer of the optical fiber distribution box in the corridor should provide the manufacturer, specification, and model of the optical splitter used, and provide the proof of purchase.

　　2.5 Work Unit

　　Ø The working unit of the optical fiber distribution box includes the optical cable fixing device, the grounding device, the optical fiber splicing disc, the optical fiber connection and distribution device, the optical splitter, the pigtail connector parking area, the leather cable fixed area, etc.

　　Ø The splicing discs of different capacities and different manufacturers must be universal and interchangeable.

　　2.6 Functional Requirements

　　1 Fixing and protection function of optical cable

　　Ø When the optical cable is introduced into the equipment, there must be reliable fixing and protection devices. The fixed optical cable metal moisture barrier, armor layer and strengthening core must be reliably connected to the high-voltage protective grounding device. After the optical cable is stripped, a plastic sleeve or screw must be used. The tube protects and secures the introduction of the optical fiber fusion splicing device.

　　Ø The coiling and binding of the butterfly optical cable must be natural and straight, without twisting, looping, etc., and necessary fixing devices should be used to ensure that it is not squeezed by external forces and damaged by operation.

　　2. The termination function of the optical fiber core: The optical cable termination device of the equipment must be convenient for the splicing, installation and maintenance of the optical fiber and the optical fiber or the pigtail, and must have the storage space for the redundant optical fiber.

　　3 Optical fiber fusion splice protection function: All-optical fiber splice parts must be protected. After the optical fiber is spliced ​​with the optical fiber, the joint part must be protected with a fusion splicing protective sleeve.

　　4 Applicability requirements for cable fibers: It must be applicable to the optical cables specified in GB, T 7424, the optical fibers specified in ITU-T G.652 and ITU-T G.657 or compatible with them, and YD, T 1997-2009 Specified butterfly cable for the access network.

　　5 Fiber adjustment function: The fiber serial number in the optical cable can be quickly and easily scheduled and the routing of the transmission system can be changed through the pigtail. The length of the pigtail must meet the requirements of the fiber adjustment operation.

　　6 Door locks: The door locks of optical fiber distribution boxes must be anti-theft structures with good anti-destructive ability. All boxes should be reserved for traditional padlock locks or other backup solutions.