Preparation for installation in external plant

Fiber optic installations in external plant (OSP) can be very different from internal installations.   External plant installations may include the installation of aerial cables, directly buried cables, cables in corrugated conduits or subducts, or the laying of submarine cable. The same connection can even comprise several types of installation, for example, aerial in a section, the placement of an underground conduit at a bridge crossing and the rest of the buried cable. 

Cables can end when entering a building, or at the tip of a post where security cameras or access points to a wireless network are located. The splices, where the cables concatenate, can be placed on pedestals, buried underground or hung from aerial splice closures. 

The diversity of the facilities in the external plant makes it very important that the contractor properly knows the cable route to be installed. Just as the estimator must travel the route before beginning the estimation process, the contractor needs to see for himself the real situations he will encounter. Such inspection allows you to determine what problems you will encounter, what special equipment you will need and even double-check that all necessary permits are in order.   The laying of long cables through underground conduits may require the use of lubricants or intermediate traction that installers must know to avoid folds of the optical cable Figure 8.

That old story that the most common failure of fiber optic telecommunications systems is caused by a backhoe that cuts cables is no joke. It reminds us that digging safely is extremely important. The risk is not only interrupting telecommunications, but also the lifetime risk of digging where there are high voltage cables or gas pipes.   There are numerous services that maintain databases with the location of the underground services, which must be contacted before any excavation, but the mapping of these must be done at the design stage and verified again before starting to dig, to ensure that you have the latest information.

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