|  | 9.7 | Range of Equipment for Testing Structured Cabling Projects
| 9.7.1 | Procedure for testing cable already installed
You have already learned that networking media is the foundation of the OSI model, and that every other layer of that model depends on, and is supported by, the networking media. You have also learned that a network is only as reliable as its cabling. In fact, many experts consider it the most important component of any network. It is important, therefore, that after you install the networking media, you determine the quality of the installation. In spite of the fact that it may have been built with the best quality cable, connectors, patch panels, and other equipment, poor installation practices can prevent a network from operating at its best. Once it is in place, the entire installation should be tested. To test your network, follow these steps: Divide the network into smaller logical groups or elements. Test each group or element, one section at a time. Make a list of any problems you find. Use the list of problem(s) to help locate any non-functioning network element(s). Replace the bad element(s) or use additional testing to determine if the suspect element is in fact, not working properly. If the first suspect element is not causing the problem, then proceed on to the next most likely element. Repair the bad or non-functioning element as soon as you find it. Replace the non-functioning element if you cannot repair it.
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