A board-to-board assembly is disclosed, comprising a plug connector and a receptacle connector. Eleven defined cross sections are determined and stored. The vacuum bases are used to fix the optical fibers, while one of the vacuum bases is fixed to the slider. It is an object of the invention to provide an entry point table having a limited size. Having recognized an off-hook state of telephone in accordance with the off-hook information, the request unit automatically initiates the directory application software.