Optical fiber terminal box

Let me introduce to you what the fiber jumper is, the type of fiber jumper, and the structure of the fiber jumper and the knowledge of the fiber optic terminal box.

What is a fiber optic jumper

Fiber optic jumpers are used as jumpers from equipment to fiber optic cabling links. It has a thicker protective layer and is generally used for the connection between optical transceivers and terminal boxes. It is used in some fields such as optical fiber communication systems, optical fiber access networks, optical fiber data transmission, and local area networks.

Types of Fiber Optic Jumpers

There are many kinds of optical fiber jumpers (also known as optical fiber connectors), that is, optical fiber connectors connected to optical modules, and they cannot be used interchangeably. The SFP module is connected to an LC fiber optic connector, while the GBIC is connected to an SC fiber optic connector. The following is a detailed description of several commonly used fiber optic connectors in network engineering:

① FC fiber optic jumper: The external reinforcement method is a metal sleeve, and the fastening method is a turnbuckle. Generally used on the ODF side (the most used on the distribution frame)

②SC type optical fiber jumper: the connector connected to the GBIC optical module, its shell is rectangular, and the fastening method is a plug-in pin-bolt type, which does not need to be rotated. (Most used on routers and switches)

③ST type optical fiber jumper: commonly used in optical fiber distribution frames, the outer shell is round, and the fastening method is a turnbuckle. (For 10Base-F connection, the connector is usually ST type. Commonly used in fiber distribution frame)

④ LC-type fiber optic jumper: the connector connected to the SFP module, which is made of a modular jack (RJ) latch mechanism that is easy to operate. (commonly used by routers)

The structure of fiber optic jumper

Optical fiber jumper (also known as optical fiber connector) means that both ends of the optical cable are equipped with connector plugs to realize the active connection of the optical path; one end with a plug is called a pigtail. Optical Fiber Patch Cord/Cable is similar to coaxial cable, except that there is no mesh shield. In the center is the glass core for light propagation. In a multimode fiber, the diameter of the core is 50 μm to 65 μm, roughly equivalent to the thickness of a human hair. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass jacket with a lower refractive index than the core to keep the fiber inside the core. On the outside is a thin plastic jacket to protect the envelope.

The fiber optic terminal box is an auxiliary facility used in the communication industry to accommodate pigtails and protect their connectors. I don’t know if you have noticed that optical cables are often used for outdoor network wiring, but twisted pairs are used indoors, and the two cannot be directly connected. Branch and continue to the indoor line.

That is to say, the optical fiber terminal box is equivalent to a joint, which plays the role of connecting the optical cable and the pigtail. First connect the end of the optical cable to the terminal box and connect it to the optical jumper. After the function of the switch, the entire optical cable is split into individual optical fibers, respectively completing the connection between the optical fiber and the optical fiber, and between the optical fiber and the pigtail. of welding. After the optical fiber terminal box is successfully installed, not only can the optical fiber and pigtail be protected and connected, but also the interference of the environment on data transmission can be reduced as much as possible, so that it has higher data transmission efficiency.

So how to install and use the fiber optic terminal box? First of all, the fiber optic terminal box is generally used indoors. If it is used outdoors, some protective measures should be taken to prevent wind and rain and exposure to shorten the service life of the terminal box. Second, the fiber optic terminal box is suitable for working at a temperature of minus twenty-five degrees Celsius to forty degrees Celsius. If it exceeds this range, the working state of the terminal box may be affected. Secondly, the service life of various systems and systems is generally about 20 years. In order to ensure its service life, the environment for storing terminal boxes has certain requirements in terms of temperature, humidity, air pressure, etc.: for example, the storage temperature is best kept at minus 25 degrees Celsius to Between 55 degrees Celsius, the air pressure is maintained between 70 and 106 kilopascals, and the temperature should be controlled below 85%.

In terms of installation, attention should be paid to the installation position of the fiber optic terminal box during installation, and an appropriate installation method should be selected. Generally speaking, the installation position of the terminal box should be 0.3 meters above the ground (or raised floor) to leave enough space to install the bottom box, adapter, external socket, power supply and other components. When fixing the terminal box, different tools and methods such as expansion screws and nails can be used according to the specific conditions of the construction site. If you need to install the device on the ground, you should pay attention to the waterproof and dustproof function of the junction box, and strengthen its compression and shock resistance.