University TV; Technology, Operation, and Services by Lawrence Harte & Rick Brown

Author:Lawrence Harte & Rick Brown [Harte, Lawrence]
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2017-03-26T04:00:00+00:00

Figure 5.13, Optical Cable Bend Ratios

Attaching Cable Attaching cable is the process of attaching cable that is not run through conduit or cable ducts to the building structure or other fixed components. Cables are typically attached to fixed objects via straps or hangers. These devices are specifically designed to hold a cable without crushing the cable while attaching it to another structure or object. Cable hangers may be designed for specific types of cables. The use of the correct type of cable hanger may be important to ensure that cables are not bent, crushed or stressed.

A cable strap is a device that is used to hold and attach a cable to another structure by applying pressure to the jacket of the cable. Cable straps come in different sizes and it is important to use a cable strap that is the correct size for the cable and its applications so that the cable does not become bent, crushed or stressed.

Cables may be attached to other lines or objects through flexible cable tie straps. A cable tie (also called a tie wrap) is a flexible strap that contains a self locking eyelet at one end that allows the other end of the strap to enter and latch so it cannot be pulled back out. The cable tie is looped around the cable and another object (such as a hanger or conduit pipe) and the end is pulled through the cable tie eyelet so a snug wrap is formed.

Service Loops A service loop is a bundle of cable that is part of a communication line (such as a pole mounted cable TV or telephone line) that provides additional cable length that may be necessary to perform a splice or cable path reconfiguration at a later time. To allow for changes or repairs to cable lines, service loops (small amounts of cable) may be looped in a cable run. Outdoor cable loops can store 100 to 200 feet of cable for each 1,000 feet of installed cable line while indoor service loops typically store 10 to 20 feet of additional cable.

The amount of cable that is contained on a service loop can dramatically vary. For cable installations in new construction areas where there is likely to be cable seeking backhoes, the amount of service loop cable may be higher to allow for multiple repairs without the need to re-install a new cable run.

Cable and Splice Enclosures Cable and splice enclosures are devices or assemblies that are used to protect cables where their splices or connections are located. A fiber optic cable or splice enclosure is a plastic or metal container that is used to cover and protect fiber optic cables. Fiber optic splice enclosures may contain multiple container shells. An outer shell may be used to provide mechanical and environmental protection and the inner shell may be used to hold the cables or a splice tray.

Splice enclosures come in different cable entry and exit configurations. An axial splice enclosure is a container that holds splices and allows the cables to enter and leave from same end.

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