iber cable without detection, but it can be done. Fiber cable is adaptable to almost any LAN configuration. Disadvantages of fiber optic cabling are as follows: Requires qualified, specially trained technicians to install it. Tends to be the highest in cost, but this depends in part on the application. The cost is coming down. Purchasing Cabling and its Installation When deciding which of the three types of cable to use, it is important to consider the cost of installation and maintenance, 260 The Telecom Handbook CHAPTER 12 and future requirements. You must evaluate the suitability for supporting your applications. When you are in the process of specifying cabling for the purpose of obtaining pricing, here are some questions to ask: Will all work be done in compliance with national, state and local codes including building codes, fire codes, electrical codes and health codes? Most areas of the U.S. no longer permit the installation of PVC (polyvinyl chloride) coated cabling in office environments, particularly running through return air plenum ceilings. This coating emits toxic gases when it burns, SO it presents a danger in the event of a fire. There is actually a lot of it installed, but the idea is not to put any more in. Teflon or other coatings, less toxic when burning, now replace it and tend to be higher in cost. What is the prior experience of the cabling installation com- pany with this type of installation? Will the installation company be responsible for the replace- ment of floor tiles, ceiling tiles and any other areas damaged due to the cabling activity? What type of cable documentation will be provided at the conclusion of the work? Building Cabling Systems Now that we have introduced some specific types of cable used in typical business installations, here is a view on the im- portance of the building cabling system. Some building owners or business users of office space view the wiring as a strategic investment. The cabling network must meet both near and long term needs. In the past, the cable 