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Classification and structure of optical cable terminal box

Optical cable terminal box is also called optical fiber terminal box. Many engineering companies are also called optical cable reel fiber box. It is a box for protecting optical cables and pigtails at the end of optical cable laying. It is mainly used for straight-through fusion and branch connection of indoor and outdoor optical cables and for cable terminals. Fixed to play the role of pigtail storage and connector protection.


Rack-type optical cable terminal box means that the optical cable terminal box is rack-mounted. The optical cable terminal box can be divided into wall-mounted (desktop, guaqiangshi), embedded, pull-out, rack-mounted and so on. The optical cable terminal box is a box that protects the optical cable and the pigtail fusion at the terminal of the optical cable laying.

The rack-mounted optical cable terminal box is generally installed with a standard network cabinet.

U is a unit representing the external dimensions of a server, and is an abbreviation for unit. The detailed dimensions are determined by the Electronics Industries Association (EIA), which is an industry group. The reason why the size of the server is specified is to keep the server at the appropriate size to be placed in an iron or aluminum rack. There are screw holes for fixing the server on the rack, so that it can be aligned with the screw holes of the server, and then fixed with screws to facilitate the space required for installing each server.

The specified size is the width (48.26cm = 19 inches) and height (multiples of 4.445cm) inside the network cabinet. Because the width is 19 inches, a rack that meets this requirement is sometimes called a “19-inch rack.” The basic unit of thickness is 4.445cm. 1U is 4.445cm, and 2U is 8.89cm twice that of 1U.

As for the desktop optical cable terminal box, it can be placed on the desktop, the bottom of the cabinet or hung on the wall.

The optical cable terminal box can be installed with FC, SC, ST, and LC optical fiber adapters to be used in different occasions, and then connected to optical communication equipment through optical fiber jumpers. The box may not be important, but the pigtails and couplers must be equipped with carrier-grade products, otherwise the loss will be too large, which will affect the communication of the equipment.

These optical cable terminal boxes will eventually be spliced ​​by optical fiber fusion splicing engineers. It is the last word to facilitate the construction of optical fiber fusion splicing engineers, and ensuring smooth communication is the quality assurance.

Optical cable terminal boxes generally have 4 ports, 8 ports, 12 ports, 24 ports, 48 ​​ports, etc. The types of ports generally include semi-circular ports, square ports, general ports, FC square ports, and straight ports, which are installed in the terminal box. There are generally four types of fiber optic couplers (alias flanges, adapters) on the market: FC, ST, SC, and LC. Generally, the desktop optical cable terminal box has 4 ports and 8 ports. After the welding is completed, it is hung on the wall or placed on the table or directly placed in the box; the rack-mounted optical cable terminal box has 12 ports, 24 ports, and 48 ports. Can be mounted on a cabinet rack.

The structure inside the optical cable terminal box includes the fiber plate for the fiber plate, the cable inlet (fixing function), the coupler installation port, the cable wire fixing bolt, etc. For the terminal box with a large number of cores, the fiber plate can be multi-layered. List stacked. For the fiber optic cable terminal box that directly exits the pigtail, there is a rubber piston at the outlet of the pigtail to prevent the iron sheet from damaging the fiber pigtail.

The pigtail used in the cable terminal box should be determined according to the communication equipment or cable model, such as single-mode optical cable, multi-mode optical cable, multi-mode 10 Gigabit optical cable (OM3), etc. In short, optical fiber couplers, optical fiber pigtails, optical fiber jumpers, optical cables 1. The transmission medium used by optical communication equipment should be consistent in order to effectively transmit and receive corresponding data signals with low loss.