Tight-Buffered Fiber Distribution Cable for Indoor and Outdoor Use
Fiber optic cables are constructed in loose tube and tight buffered. In the past two decades, tight-buffered fiber optic cable has been sufficiently proved to be suitable for both indoor and outdoor applications. One of the main reason is that tight-buffered cables provide fast, easy, economical termination which satisfy the diverse requirements existing in high performance fiber optic applications. Distribution fiber optic cable is also a tight buffered design, which is ideal for applications requiring a single termination point with multiple fibers. Therefore, tight-buffered fiber distribution cable is usually installed in intra-building backbone and inter-building campus locations, and it provides plenum and riser rated fiber cables for indoor and outdoor applications.
Tight-buffered fiber distribution cable consists of several tight-buffered fibers consolidated in a single cable. Compared with the bare fiber, the tight-buffered fiber is coded with an additional 900um layer over the 250um fibers for protection (as shown in the following picture). Generally, the tight-buffered distribution cable comes in various fiber counts ranging from 2 to 144 fibers. According to different application requirements, these cables are usually plenum or riser rated but can also be constructed as an indoor/outdoor or low-smoke (LSZH) cable. The following section will dwell specially on the applications of tight-buffered fiber optic cables.
When it comes to deploying cables for indoor applications, the important factor that should be considered is flame ratings. According to the NEC (National Electric Code), flame ratings generally include plenum, riser, general, etc., as shown in the following picture:
Among these different rating cables, the plenum tight-buffered distribution cable is being run through environmental airflow spaces. In vertical runs, we usually use riser tight-buffered distribution cable. These tight-buffered distribution cables provide high-density connectivity and ease of installation within the buildings.
Tight-buffered fiber optic cable is optimal for indoor applications. With the design of armored layer, they are also used for outdoor applications. Armored LSZH tight-buffered distribution cable consists of tight buffer fiber, glass yarn strength member, corrugated steel tape armor and a double LSZH jacket being of UV stabilized, water and moisture resistant. Because of its solid construction, armored LSZH tight-buffered distribution cable is a good choice for LAN backbones, direct burial, ducts, under floor or ceiling spaces.view this document