What Is FOSC？Fiber Optic Splice Closure

FOSC, also known as Fiber Optic Splice Closure, is a device used in optical fiber communication systems, mainly used to protect and manage the connection points between optical cables.

 

 

1. Shell
It is usually made of high-strength plastic or metal materials, and has good waterproof, dustproof, corrosion and compressive resistance, which can protect the fiber optic connector inside from the external environment.
Designed with a rubber sealing ring and fastening device, it ensures that the box body can maintain a good seal under various environmental conditions.
2. Support frame
It is used to secure the fiber optic cable so that it maintains a stable position inside the box.
Generally, it is made of plastic or metal, which has a certain strength and flexibility, and can adapt to different diameter optical cables.
3. Fiber optic fixtures
Includes fiber clamps, trays, etc., to secure the fiber and prevent it from moving during the splice process.
Make sure the fiber is positioned accurately for precise splice operations.
4. Seals
Such as sealant, rubber pad, etc., which are used to fill the gap between the box and the optical cable to prevent moisture and dust from entering the box.
Ensure the sealing performance of the splice box and extend the service life of the fiber optic connector.

5. Optical fiber adapter/connector
The optical fiber used to connect different optical cables to ensure the efficient transmission of optical signals.
6. Splice tray
It is used to place and protect the optical fiber splicing point to ensure that the spliced optical fiber is neatly arranged to avoid physical damage.
7. Identification label
used to mark the specific information of optical cables and optical fibers, which is convenient for management and maintenance.

 

When two cables need to be spliced, the cables are stripped to reveal the fiber. The fibers are then passed through the inlets of the splice box and fixed on the fiber fixtures. The two optical fibers are spliced by means of a fusion splicer or other equipment, so that the optical signal can be transmitted between the two optical fibers. Then, the spliced optical fibers are neatly arranged on the splice tray and fixed using an optical fiber finishing device. Finally, close the splice closure shell and seal the splice box to prevent the influence of the external environment on the fiber connector.

1.Classification by appearance

 

Horizontal fiber optic splice closure

Flat shape, long in length and narrow in width
Horizontally placed, suitable for overhead, pipeline and other installation environments
Takes up less space

 

Vertical fiber optic splice closure

Vertical structure, high height and narrow width
Installed vertically, it can be fixed to vertical structures such as poles and towers by hoops
It has advantages in mountainous and complex terrain installation

 

2. Classification by sealing method
Mechanically sealed fiber optic cable splice box
The sealing of the box body is mainly achieved through bolts, buckles and other mechanical structures.
It usually has good mechanical strength and stability, and can withstand a certain amount of external impact.
Installation requires the use of tools to tighten and ensure sealing performance. For example, in some field environments, mechanically sealed splice boxes can better resist the influence of natural factors such as wind and rain.
Heat-shrink sealed fiber optic cable splice box
Sealing is carried out using the properties of heat shrinkable materials. During installation, the heat shrink tubing is sleeved at the junction of the fiber optic cable and the splice box, and the heat shrink tubing is contracted by heating to achieve a seal.
The heat shrink seal has good waterproof and moisture-proof performance, and the sealing effect is more reliable.
It is suitable for occasions with high sealing requirements, such as underwater optical cable splicing.
Adhesive sealed fiber optic cable splice box
The sealing of the box is achieved by using adhesives such as sealants.
Adhesive seals are relatively simple to operate and can be sealed quickly. However, the quality and construction technology of the sealant have a great impact on the sealing effect.
It is often used in some temporary or rapid repair occasions.

3. Classification by applicable optical cable type
Ordinary fiber optic cable splice box
It is suitable for conventional communication optical cables, such as outdoor overhead optical cables, pipeline optical cables, etc.
Generally, it can meet the needs of optical cable connection in the construction of most communication networks.
Ribbon cable splice box
It is specially used for the splicing of ribbon fiber optic cables. Ribbon cables are usually composed of multiple fibers and have a ribbon structure.
The ribbon cable splice box is designed with a special optical fiber fixing and splice device, which can easily connect and manage the ribbon fiber.
In the construction of some large-capacity communication networks, ribbon optical cable splice boxes have been widely used.
Submarine cable splice box
It has special waterproof, pressure and corrosion resistance, and is suitable for the splicing of submarine optical cables.
Submarine cable splice boxes are typically made of high-strength materials that can withstand the high pressures of the deep sea and the harsh marine environment.
Installation and maintenance are difficult and require professional equipment and technicians to operate.

4. Classification by installation method
Overhead fiber optic cable splice box
Designed for the splicing of overhead fiber optic cable lines.
It usually has good wind resistance, ultraviolet resistance and aging resistance, and can work stably for a long time in outdoor overhead environments.
It is generally equipped with a suspension device, which is convenient for installation on supporting structures such as overhead steel strands.
Duct type fiber optic cable splice box
It is suitable for the splicing of optical cables in pipes.
The compact form factor makes it easy to install and maintain in the pipeline. It usually has good waterproof performance to prevent moisture from entering the box.
Some duct-based splice boxes are also designed with openable lids to facilitate cable splicing and maintenance without damaging the pipes.
Directly buried fiber optic cable splice box
It is used for the splicing of directly buried fiber optic cables, which can withstand the pressure and corrosion of the soil.
It usually has high mechanical strength and good sealing performance, which can protect the optical fiber connector from working stably underground for a long time.
Directly buried splice boxes are generally made of corrosion-resistant materials and subjected to special anti-corrosion treatments.

1.Protect fiber connector
The splice box provides an enclosed space for the optical fiber connector to avoid direct exposure to air, prevent erosion by moisture, dust, ultraviolet rays and other factors, and can withstand certain mechanical external forces, such as stretching, bending, extrusion, etc., to protect the optical fiber connector from damage and ensure the stability and reliability of the optical fiber connection.
2.Realize fiber splicing and connection
Splice trays and fiber adapters are provided for the splicing and connection of optical fibers, so that the fiber splice work can be carried out in a relatively stable environment. Ensure the quality and stability of optical fiber splicing, and ensure the transmission performance of optical signals.
3.Easy to maintain and manage
The splice box is usually marked with information such as the number of optical cables and the number of cores, which is easy for maintenance personnel to identify and manage.
The built-in optical fiber finishing device helps to arrange the optical fibers neatly, avoid winding and excessive bending, and reduce the loss of signal transmission. When maintenance or troubleshooting is required, the splice box can be easily opened to inspect and repair the fiber connector.
4.Environmental adaptability
Able to work well under different environmental conditions (e.g. temperature changes, humidity changes).

1. Telecom operator networks
In the construction of communication networks such as long-distance communication trunk lines, local networks, and access networks, optical cable splice boxes are widely used in the connection and branch of optical cables. Ensure the stable transmission of communication signals and meet people's needs for high-speed, large-capacity communication.
2. Radio and television transmission
It is used in the transmission network of radio and television signals, connecting optical cables in different sections to ensure high-quality signal transmission.
It plays an important role in the fields of cable TV and satellite TV.
3. Power communication system
In the communication network of the power system, the optical cable splice box is used to connect the optical cables between substations, power plants and other places to realize the transmission of information such as power dispatching and automatic control.
4. Public facilities
It is used in communication stations such as railways, highways, bridges, tunnels, urban rail transit, and traffic monitoring networks, and optical cables connecting various communication stations, surveillance cameras and other sensors along the line.
5. Enterprise campus network
Inside the data center, fiber optic cables are used to connect different servers and storage devices.
In the integrated wiring system of the intelligent building office park, the optical cable splice box is used to connect the optical cables in different areas of the building to achieve high-speed data transmission, video surveillance and other functions.
6. Petrochemical and other industrial fields
In the communication system of petrochemical, mining and other industrial fields, the optical cable splice box is used to connect the optical cable between various production equipment and control centers in the plant area to realize the automatic control and monitoring of the production process.
7. Military and Government Agencies
In the military command system, fiber optic cables are used to connect different command centers and combat units.
In the communication network of government departments, fiber optic cables are used to connect different office locations to ensure the efficient transmission of government information.