As mentioned before, the installation process is very simple. A maximum of 250 modules can be interconnected to form one bus line (also referred to as a segment). Each bus module is simply connected to the phase, neutral and data wire. If by design more units are required, a new bus line or segment has to be added. Both bus lines can now be joined using the LCN-Coupler modules. Segment modules offer an easy method in dividing the modules into smaller areas. If we for example look at a sky scraper each floor may have between 100 and 150 bus modules. A segment linker module is then installed on every floor. This simplifies module-identification and thus maintenance work. Each line can be extended to a length of approximately 1000 yards. In practice this length is easily exceeded when installing LCN in large factory sites. In this case the bus lines can be joined using fibre optics or line amplifiers. However, if the sum of the bus modules on both lines exceeds 250, a pair of segment linker modules is also required. With standard glass core fibre optic units the line can be extended by approx. 2000 yds, whereas plastic fibre optics can only be used for extensions up to 100 yds. The line amplifiers, from which always two or more are used, would extend the bus system by 1000 yds each, but have to be placed within a distance of 4 to 5 yds to each other. Currently the maximum number of bus modules that can be connected in a building is 30,000, serving more than 0,5 million data points. That fulfills the requirements of almost every application. As far as network topology is concerned, no special rules apply.