The Connection Among Fiber Terminal Box, Patch Cable And Pigtail

Generally in the network cabling, outdoors (connection between buildings) use fiber optic cables, while indoors (inside buildings) use Ethernet twisted pair cables. Then how to convert the transmission media between the Outdoor Optical Network and the Indoor Ethernet Network?

And what devices are used in the connection? What roles do they play? How about the relationship between them? The answers are as following. Firstly, the mainly used devices are fiber terminal box, fiber optic patch cable, fiber optic pigtail and optical transceiver module etc.

Connection Relationship:

  • Step 1: Access outdoor fiber optic cables into fiber terminal box for the purpose of splicing the optical fiber cable and fiber optic pigtail, leading out it by using fiber optic patch cable.
  • Step 2: Access the fiber patch cable into fiber transceivers to convert optical signals into electrical signals.
  • Step 3: Electrical signal sent by the fiber transceivers uses the transmission medium of twisted pair. At this point UTP network devices can be connected to RJ-45 connectors. So far, the conversion of optical signals is completed.

Tips: There are many network devices which have optical ports, but if there is no optical modules (similar to the fiber optic transceiver functions), the ports can not be used.

Fiber Terminal Box is a terminal protection box for the splicing of fiber optic cable and pigtail. Fiber optic terminal box is a cable end fitting. Its two ends are fiber optic cables and pigtails, the equivalent is to be split into a single fiber optic cable equipment. Fiber terminal box is used to terminate fiber optic cable, and connect the core to pigtails. The access fiber cable can have multi cores, for example, a 4-core cable (cable has four cores), through terminal box, you can splice this optical cable to a maximum of four pigtails, that leads out of 4 fiber patch cables.

Optical Pigtail: connector at one end and the other end is a cable core breakage. By welding, is connected with the other cable core. Also known as swine pigtail cable terminal box to the device that is used for the connection between the optical fiber. Often divided into single-mode or multi-mode fiber pigtail, single fiber or dual fiber, transmission distance, as well as pigtail interface type. Commonly used in fiber optic devices currently on the market pigtail interface types are generally: FC, SC, LC, ST these four.

The role of fiber pigtail is mainly used to connect both ends of the connector, pigtail splicing fiber optic connectors at one end with the other end through a special connector (FC, SC, LC, ST) with fiber-optic transceiver or optical module is connected, constituting the optical data transmission path. Where FC and FC connectors generally used in communications transmission equipment; ST connectors are generally the first coupler adapter, and then connect to fiber optic transceiver modules.

Usually there are no pure fiber optic pigtails on sale (FOCC can supply), but we can cut the fiber patch cable from the middle, it then becomes two fiber pigtails. Pigtails for use in terminal box, connect the fiber optic cable through the terminal box coupler (adapter) to connect pigtails and fiber patch cables.

Fiber Optic Patch Cable: Its two ends are both active joints. It is used for connecting fiber optic pigtails and devices. It has thick protective layer, and is commonly used in the connection between optical transceiver and fiber terminal box. It is also called fiber jumper or fiber optic patch cord.

Fiber splice tray is used for abutting joint a two fiber optic cables into a long one. They are not interchangeable between, fiber optic cable and optical transceiver is connected via fiber optic terminal box, that is, can only be inserted on optical pigtail. Fiber terminal box and splice tray can be understood as: in which the optical fiber splice two heads, but the former is a fiber optic cable and pigtail splice, which is a fusion between cable.

Fiber optic closure and fiber terminal box are not the same. Fiber optic closure is fully sealed, waterproof but it can not fix pigtails; fiber terminal box is not waterproof, while the internal structure can fix fiber optic cables, pigtail coupler can be fixed while only connecting two pigtails and sub SC/PC FC/PC interfaces, which is between fiber optic cables and pigtails spliced by splicing machines.

What is the difference between the fiber patch cable and fiber optic pigtail? Can the fiber patch cable be divided into two fiber pigtails? Only one end of fiber pigtail is an active connector, while fiber patch cables have active joints on both ends. There are many different interfaces require different couplers. Fiber patch cables can be used as a divided two pigtails with.

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