(Usually the integrated wiring system is updated every seven years. It took five years to go from Category 3 to Category 5 system. It took only three years to replace Category 5 system with Category 5 system. Now, Category 6 system has become old. And it is widely used. It is already a trend to terminate Gigabit Ethernet on Category 6 systems, while the specifications for Category 7 systems are being formulated and implemented. It is the latest policy for 10 Gigabit copper cables to maximize the use of copper cabling systems.)