Introduction of rack-mounted optical cable terminal box

The terminal box series products are auxiliary equipment for terminal wiring in the optical fiber transmission communication network. The terminal box is mainly used for the fixation of the optical cable terminal, the fusion of the optical cable and the pigtail, and the storage and protection of the residual fiber.

The terminal box is composed of three parts: shell, internal components, and optical fiber connector protector. Shell: The shell should be easy to open and install; the shell should have a lead-out device for grounding the high-voltage protection of the metal components of the optical cable.

Internals: Internals shall include the following parts:

1. Support frame: the main body of the internal structure, used for the support of the internal structure;

2. Fiber collection tray: used to store optical fiber connectors (and their protective parts) and remaining optical fibers in order. The length of the remaining optical fibers should not be less than 1.6m, and the radius of curvature of the remaining optical fibers should not be less than 37.5mm. And there is a space for easy identification of fiber number and convenient operation for reconnection;

3. Fixing device: used to fix the optical cable sheath, the optical cable strengthening member and the wiring pigtail. Optical fiber connector protection parts: The protection of optical fiber connectors can use heat shrink protection tubes, protective clips, etc.

ZR Cable Terminal Box

1. It has the functions of introducing optical cables, pulling out the wiring pigtails and fixing and protecting the optical cables, wiring pigtails and the optical fibers in them from damage.

2. It has the function of protecting the fiber optic cable termination from the environment.

3. It has the function of insulating the metal components of the optical cable from the casing of the optical cable terminal box and can easily lead to the grounding.

4. Provide space for the placement of optical cable terminals and the storage of remaining optical fibers, and make installation and operation convenient.

5. The box body can be fixed with sufficient impact strength, and has corresponding installation functions for different occasions.

6. When necessary, it should have the function of optical cable branch connection. Functional requirements

7. The service life is up to 20 years

The terminal box is the place where the end of the optical cable is connected, and then connected to the optical switch through the optical jumper. Therefore, the terminal box is usually installed on a 19-inch rack, which can accommodate a relatively large number of fiber optic cable ends. The terminal box is to connect the optical cable with the pigtail for protection.

As the carrier of information transmission, the terminal box has become an important pillar of modern communication with optical fiber hardware as the information transmission medium. The optical cable terminal box technology has gone through several decades from the theoretical proposal to the technical realization in the engineering field, and then to the realization of today's high-speed optical fiber communication. The birth and in-depth development of optical fiber communication technology is an important reform in the history of information communication.

The terminal box is widely used in local telephone, rural telephone network system, data and image transmission system, CATV cable TV series, used for direct connection and branch connection of indoor optical cable, and plays the role of pigtail storage and protection joint. It is made of rolled steel plate by electrostatic spraying, with reasonable design structure and beautiful appearance.

Mechanical behavior

After the following tests, the box body of the terminal box and each part in the box should be changed, and the optical fiber inspection should be carried out if necessary.

1. Tensile: The terminal box and an optical cable should be able to withstand an axial tensile force of not less than 500N, and the axial tensile force of not less than 5N between the terminal box and any wiring pigtail.

2. Flattening: all sides of the terminal box body should be able to withstand a vertical static pressure of not less than 200N

3. Torsion: The terminal box should be able to withstand the torsion angle

The remaining optical fibers in the terminal box are coiled in the fiber collecting tray, and the optical fibers and optical fiber connectors shall have no additional attenuation after the installation operation of the terminal box.

surroundings

1. The terminal box is not suitable for use in the open air. If it is to be used, protective measures should be taken.

2. Working temperature: -25℃～+40℃

3. Storage temperature: -25℃～+55℃, relative humidity: no more than 85% (at 30℃)

4 Air pressure: 70～106kPa

Fiber optic terminal boxes generally use the following fiber optic couplers:

What is a fiber optic coupler?

1. Aliases: Fiber optic couplers are also known as fiber optic adapters, also known as fiber optic flanges.

2. Definition: A device for detachable (active) connection between optical fibers and optical fibers. It precisely connects the two end faces of the optical fibers, so that the light energy output by the transmitting optical fibers can be coupled to the receiving optical fibers to the greatest extent. And make it intervene in the optical link to minimize the impact on the system.

3. Classification: According to different classification of optical fibers

SC fiber optic coupler: applied to SC fiber optic interface, if it is 8 thin copper contacts, it is an RJ-45 interface, and if it is a copper column, it is an SC fiber optic interface.

LC fiber optic coupler: used in LC fiber optic interfaces, connectors for connecting SFP modules, commonly used in routers.

FC fiber coupler: applied to FC fiber interface, generally used on the ODF side.

ST fiber coupler: used in ST fiber interface, commonly used in fiber distribution frame.

What is the role of fiber optic couplers?

1. Convert optical signals into electrical signals

2. Coupling multi-mode signals into single-mode signals

3. Connect the cross-section fiber holes of the two fiber connectors

4. Connect the two sets of optical signals to each other

An optical fiber pigtail is a short length of optical fiber permanently attached to an element to facilitate the connection of the element to another optical fiber. Fiber pigtail refers to a connector similar to a half jumper used to connect optical fibers and fiber couplers, which includes a jumper connector and a section of optical fiber. Or connect transmission equipment and ODF racks, etc.

Pigtails are commonly used as pigtails

Pigtail bundles, also known as bundled pigtails, have only one end with a connector, and the other end is a broken end of an optical fiber, which is connected to the core of other optical cables by fusion splicing. Terminal Equipment.