Abstract: Line-oriented communication devices are coupled by a data network interface to a packet-oriented data network. The data network interface has a data network connection for coupling a data network cable to the data network, as well as a communication network connection for coupling a communication device for setting up line-oriented communication links. The data network interface couples the communication network connection and the data network connection to transmit communication signals on the communication links between the communication network connection and at least one supply conductor, which is provided for supplying voltage to data communication devices in the data network, in the data network cable.

Abstract: The invention relates to a power supply circuit comprises several power supply modules for supplying power to various sub-assemblies and/or interfaces of electrical equipment, e.g. a communications equipment or a personal computer, in addition to a regulating circuit that regulates a first power supply module. The regulating circuit is connected to the power supply outputs of those power supply modules, between which a maximum voltage differential deviates from a reference value, the first power supply module is corrected in such a way that the deviation is minimized.

Abstract: The invention relates to a power supply circuit comprises several power supply modules for supplying power to various sub-assemblies and/or interfaces of electrical equipment, e.g. a communications equipment or a personal computer, in addition to a regulating circuit that regulates a first power supply module. The regulating circuit is connected to the power supply outputs of those power supply modules, between which a maximum voltage differential deviates from a reference value, the first power supply module is corrected in such a way that the deviation is minimized.

Abstract: For the flexible linking-up of a so-called home network to further data networks, a network coupling device, with which the home network can be coupled to a local area network, is provided. The network coupling device couples the two data networks on the data link layer of the OSI reference model and is consequently transparent with respect to all the higher protocol layers. The transparent coupling to a local area network provides the home network with access to the entire infrastructure of the local area network, and to all the further data networks accessible from the latter, without any additional expenditure.

Abstract: Line-oriented communication devices are coupled by a data network interface to a packet-oriented data network. The data network interface has a data network connection for coupling a data network cable to the data network, as well as a communication network connection for coupling a communication device for setting up line-oriented communication links. The data network interface couples the communication network connection and the data network connection to transmit communication signals on the communication links between the communication network connection and at least one supply conductor, which is provided for supplying voltage to data communication devices in the data network, in the data network cable.

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.

Abstract: For the flexible linking-up of a so-called home network to further data networks, a network coupling device, with which the home network can be coupled to a local area network, is provided. The network coupling device couples the two data networks on the data link layer of the OSI reference model and is consequently transparent with respect to all the higher protocol layers. The transparent coupling to a local area network provides the home network with access to the entire infrastructure of the local area network, and to all the further data networks accessible from the latter, without any additional expenditure.