Forward planning is an essential point in all cabling issues. This enables future-proof structures and prevents subsequent changes, additions and unplanned replacement of parts of the network. Structured cabling is hierarchical and uses star and tree topologies. The layout of all components must be adapted to the requirements of modern networks (switched networks). Therefore, planning includes not only cables but also components such as cables, connectors, junction boxes and patch panels. These must be insensitive to interference, guarantee secure transmission and include redundant lines.