hat the system can handle. This performance is effectively a com- have been listed and the limits of this type of media have been bination of the cable, the equipment and how they are installed. Testing 33/7 System performance specifications usually come in two parts; a Installation rules must be adhered to to minimise interference general performance guarantee and a list of service specific limita- from power cables, shredders, fluorescent lamps, lift motors and tions. This is shown in Table 33.5. telephone ringing and dialling signals. Equally as important to noise induced into the system is the issue of noise emission from the system that could interfere with other equipment. This is covered by an EEC standard No. EEC 89/336 Electromagnetic Compatibility and part 15 of FCC Rules. Table 33.5 Performance guarantee Service Distance (meters) At Mb/s 33.7 Testing General performance Because of the future proof/flood wire nature of a structured cabling system only part of it will be used at the time of installation. The Token Ring installed equipment cannot be used for testing as this only uses some Ethernet of the system's capacity. A total system test is required, encompas- sing every pair throughout the system. Token Ring There are a number of automatic test units on the market which IBM 3270 will do this very efficiently. Some test equipment used on UTP was developed for voice wiring and adapted to cover data cables, while IBM AS400 others have been developed for Ethernet and Token Ring installa- RS232 0.0096 tion. The way in which the test equipment connects into the system is an important consideration. A quick connection method encompas- sing several circuits can save a lot of testing time. 33.6.1 Installation specification Some automatic systems sequence through the pairs, others send a unique signal down each wire. Most require a piece of equipment The installation specification for a structured cabling system en- at each end of the wire to test all possible types of faults, although sures that the equipmen