Abstract: Switching apparatus with ISDN access that provides an ISDN interface unit which has the advantage of being realized in a separate housing with which already existing apparatuses realized on a module can be used, the switching apparatus being constructed via coupling with an ISDN module which handles the communication between ISDN and USB, wherein the apparatus can be connected to the personal computer while the latter is in operation, and constitutes a unit that can be sold and maintained separately.

Abstract: For interconnecting data networks which use cabling, which is actually provided for other purposes, as transmission medium for data packets, a private branch exchange is provided for connecting subscriber terminals via subscriber lines. The private branch exchange has an integrated interconnecting device via which data packets which are transmitted via the subscriber lines and which are coded into signals outside a frequency range used for communication with the subscriber terminals are extracted from a first subscriber line and extracted data packets are injected into a second subscriber line.