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Learn more about fiber optic cable, terminal box, pigtail connection and various fiber interfaces


In network cabling, fiber optic cables are usually used for connection between outdoor buildings, and optical fibers or network cables are used inside indoor buildings. So how to convert between the optical cable transmission medium outside the building and the Ethernet transmission medium inside the building? What equipment was used in it? What is their role? What about the relationship between them?
Pigtail: used in the terminal box to connect the optical fiber in the optical cable, and connect the pigtail and the jumper through the terminal box coupler (adapter).
Jumper: Both ends of the fiber jumper are movable connectors, which serve to connect the fiber jumper and the device.
Optical cable terminal box: It is a box where the terminal laid on the optical cable protects the fusion of the optical cable and the pigtail.
Optical fiber coupler: It is used for the active connection of two optical fibers or pigtails, commonly known as flanges.
Optical fiber terminal box: It is the end connector of an optical cable. His one end is an optical cable and the other end is a pigtail, which is equivalent to a device that splits an optical cable into a single optical fiber.
Optical fiber fusion splice box: It is used for connecting two optical cables into a long optical cable. The optical fiber terminal box and the optical fiber fusion splice box are not interchangeable, and the optical cable and the optical terminal are connected through the optical fiber terminal box, that is, only the optical fiber can be inserted into the optical fiber terminal.
Coupler: Only two pigtails can be connected and divided into SC/PC FC/PC and other interfaces, and the fusion between the optical fiber cable and the pigtail is dead.
Terminal box VS fusion splice box: The former is the fusion of fiber optic cable and pigtail, the latter is the fusion between fiber optic cable.
Connection box VS terminal box: The connection box is fully sealed and waterproof, but it cannot fix the pigtail; the terminal box is not waterproof, and the internal structure can fix the fiber cable on one side and the pigtail on the other.
Pigtail VS jumper: only one end of the pigtail is an active connector; both ends of the jumper are movable connectors. There are many types of interfaces. Different interfaces require different couplers. The jumper is divided into two and can be used as a pigtail.
Connection relationship of optical cable, terminal box, and pigtail

1. The outdoor optical cable is connected to the terminal box, and the purpose is to fuse the optical fiber and the pigtail in the optical cable and lead it out through the jumper.
2. Connect the optical fiber jumper to the optical fiber transceiver, the purpose is to convert the optical signal into an electrical signal.
3. The optical fiber transceiver sends out electrical signals, and the transmission medium used is twisted pair. At this time, the twisted pair can be connected to the RJ-45 port of the network device. So far, the photoelectric signal conversion is completed.
Note: At present, there are many network devices that also have optical ports (optical fiber interfaces), but if there is no optical distribution module (similar to the function of optical fiber transceivers), this port cannot be used.
The role of optical cable, terminal box, and pigtail
The function of the optical fiber terminal box: terminate the optical cable, connect the fiber core and pigtail in the optical cable, the internal structure of the optical fiber terminal box, the inserted optical cable can have multiple cores,
For example, a 4-core optical cable (there are 4 cores in the optical cable), then this optical cable can be spliced ​​up to 4 pigtails through the terminal box, that is, 4 jumpers are led out. If only 2 wires are welded, 2 jumpers will be led out.
Pigtail: There is a connector at one end and a broken end of an optical fiber core at the other end. Through fusion splicing, it is connected with other optical fiber cores.