Issue link: https://www.e-digitaleditions.com/i/1107553
18 I ICT TODAY FIGURE 8: Testing an OSP spool of optical fiber. It is always recommended to test cables after delivery and compare the OTDR test results to the affixed test document on the spool. The cabling installers should also conduct the third stage pre-functional testing (PFT) of raw (unterminated) fiber spools. This requires field testing by fusion splicing selected optical fibers from each spool and conducting optical time domain reflectometer (OTDR) tests before installation begins. The PFT test results are compared to the test documentation removed from the spools and should be nearly the same (Figure 8). Any abnormalities need to be immediately addressed before beginning the installation. Preterminated fibers are usually shorter in length and packaged securely. It is still a good practice to organize and store the manufacturer's hard copy test documentation. Like the spools, when testing a link that fails, it can be compared to the manufacturer's test documentation. This can help to determine whether the cable was damaged during field manufacturing or installation. Continual commissioning includes site visits to perform QA visual inspections. This is to ensure installation best practices are being followed. Cable routing, securing, and dressing should have a professional and consistent clean look that is maintained throughout the entire installation process. The ICT consultant must be able to guarantee that the installation is following the SOW/BOM and drawings, as well as ensuring that the labeling and testing procedures are in full compliance. In pre-design, consider whether the cabling infrastructure concept was designed for the long-term. Will it allow for the future growth & high demands of IoT?