Black Box Explains... Fan-out kits.
Furcating is the process of adding protective tubing to each fiber within a loose-tube cable. It can be a headache-inducing task if you dont have the right tools. If you... more/see it nowbend the cable or buffer tubes past their recommended bend radius, or if you allow them to kink, youll end up with substandard cable connections and splices that can break down over time. And, if the cable is outdoors, it can become exposed to the elements. The end result: a damaged cable without optimal transmission performance.
Thats why a fan-out kit is an absolute must during furcation. These kits enable you to branch out the fragile fiber strands from a buffer tube into protective tubing so you can add a connector. And, you can do it without using splicing hardware, trays, and pigtails.
To separate the fibers, use the kits fan-out assembly, which is color-coded to match the fiber color scheme. The assembly protects the cables bend radius. It also eliminates excessive strain on the fibers by isolating them from tensile forces.
Several types of fan-out kits are available for both indoor and outdoor cross-connects. The outdoor kits include components that compensate for wider temperature fluctuations. Some kits are used to terminate loose-tube cables with 6 or 12 fibers per buffer tube. Others enable you to furcate and terminate more than 200 loose-tube cable fibers, sealing the cable sheath and providing a moisture barrier at the point of termination. These kits require no additional hardware.
Although its recommended that you terminate loose-tube cable at a patch panel, that might not always be possible. For this, there are spider type fan-out kits, which affix a stronger tubing to the bare fiber. The tubing is typically multilayered, consisting of a FEP inner tube that holds the individual fiber, an aramid yarn strength member, and an outer protective PVC jacket. Once you strip back the cable jacket, you thread the fibers into the fan-out inserts. collapse
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Using optical break locators and OTDRs.
An optical time-domain reflectometer, or OTDR,
is an instrument used to analyze optical fiber. It sends a series of light pulses into the fiber under test and analyzes the light... more/see it nowthat is scattered and reflected back. These reflections are caused by faults such as breaks, splices, connectors, and adapters along the length of the fiber. The OTDR is able to estimate the overall length, attenuation or loss, and distance to faults. It’s also able to “see” past many of these “events” and display the results. The user is then able to see all the events along the length of the fiber run.
However, OTDRs do have a weakness?—?a blind spot that prevents them from seeing faults in the beginning of the fiber cable under test. To compensate for this, fiber launch boxes are used. Launch boxes come in predetermined lengths and connector types. These lengths of fiber enable you to compensate for this blind spot and analyze the length of fiber without missing any faults that may be in the first 10–30 meters of the cable.
An optical break locator, or OBL, is a simplified version of an OTDR. It’s able to detect high-loss events in the fiber such as breaks and determine the distance to the break. OBLs are much simpler to use than an OTDR and require no special training. However, there are limitations. They can only see to the first fault or event and do not display information on the portion of fiber after this event. collapse
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