Fiber Optic In-Line Closure

A fiber optic in-line closure, also called a splice closure, is used with outdoor fiber optic cables to provide space and protection for the splicing and joint of the cable. They are usually made from a rugged outside shell and include an inside compartment for the spliced section of the cable to reside. They protect the splice area from a variety of dangers, such as pressure, extreme temperatures, moisture, insects and vandalism.

While many Fiber optic in-line closure have similar designs and capacities, there are some key factors to consider when selecting a particular one for a network project. A key factor is compatibility with the cable that will be installed in it. This will determine what types of adapters or additional hardware are needed to fit the cables. Identifying this information before you go shopping for closures can help save you time by narrowing down your options.

Another consideration when choosing a splice closure is how easy it will be to install and access. Some closures require specialized tools to open or close, while others use basic household items to do the job. Consider how often you will need to re-enter the closure and what types of tools you may have available before choosing a design.

What Is a Fiber Optic In-Line Closure?

In addition, the splice closure must be weather and corrosion resistant. This is important for any outdoor deployment, but especially so if it will be exposed to harsh environments. A good choice will have a durable outer shell and be designed to resist aging from ultraviolet light, which can cause plastics to degrade over time. It will also have a reliable seal, which is essential to keep out moisture and bugs.

There are two main types of splice closures for outside plant FTTx networks: the horizontal type and the vertical type. The horizontal type is flat or cylindrical and is mounted aerially, buried underground or in ducts. This type of fiber closure typically has a high number of ports, meaning it can handle hundreds of connections. The vertical type, which resembles a dome and is sometimes called a fiber dome closure, can be buried in several applications or used above ground. It is commonly used for FTTH tap locations and offers different capacities for splice trays.

For both types of splice closure, you will need to find the right size for your deployment. This will depend on how much cabling you expect to run and what you plan to do with it once the service is live. A good option is a hybrid fiber closure that can accommodate a 48-count feeder cable and up to 12 flat drop cables. These are ideal for distribution or fiber-to-the-premises networks. You can also choose a more compact version that is suitable for pedestal or other below-ground installations. You can also select a waterproof splice closure if you plan to install it in wet or flood-prone areas.

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