A modular cabling system with keystone technology offers many advantages. In addition to flexible snap-in mounting and a wide selection of standard plug-in connectors in fibre optic cable and copper technology, a special highlight of the shielded copper variants is their self-contained keystone housing. It provides excellent transfer characteristics and allows flexible maintenance and repair. Besides, „tool-free“ keystones can be installed very quickly, because no special tool is required. Just a side cutter is sufficient to shorten the wires to the appropriate length and to assemble the keystone in a professional manner.