Abstract: A method is described for transmitting digital data using the time-division multiplex method, in which the data are transmitted within a sequence of time frames (82, 84). In each time frame (82, 84), at least the number of transmitted data bits matches the option defined in the ISDN Standard for 2B1Q transmission. However, a plurality of time frames (82, 82), which form an overall frame (80), are transmitted within the time which is specified by the ISDN Standard for the transmission of an ISDN Standard time frame (60).

Abstract: For the transmission of ATM digital signals of a program unit, particularly of digital, data-compressed video distribution signals, from a remote digital signal source, particularly a video server, via a head station of a light waveguide and/or coaxial line tree network respectively shared by a plurality of subscriber-side network termination units to at least one of the subscriber-side network termination units, whereby an intermediate storing of such ATM digital signals transmitted with elevated data rate occurs in the head station, the program unit is transmitted from the digital signal source to the intermediate memory of the head station with a data rate that is slightly elevated compared to the data rate nominally required for the program unit and that is retained for the entire duration of the transmission, the data stream being further-transmitted therefrom to the respective subscriber with the signal clock nominally required for the program unit that is offered by a reference clock source; the refere

Abstract: A method and a circuit arrangement for controlling the transmission of information for interactive services are provided. The circuit arrangement includes a network structure having a network control center and into which at least one network node, at least one server, at least one connection unit connected to a plurality of network termination devices and to subscriber devices allocated thereto are inserted, wherein information between the at least one server and at least one of the plurality of subscriber devices is transmitted at least in sections in a uniform channel grid; and a peripheral control device provided in the at least one connection unit as well as in the network termination devices allocated to the respective subscriber device for controlling transmission of the information between the respective server and the respective subscriber device.

Abstract: For data security in a digital telecommunication system having a plurality of subscriber equipment, a public key is respectively calculated from a secret key prescribed in a first subscriber equipment. This public key is communicated to a second subscriber equipment that it participates with in a connection with the subscriber equipment being used in this second subscriber equipment for encoding secondary key information for matching the first subscriber equipment to transmission modalities that are repeatedly modified and that are provided in the second subscriber equipment for the first subscriber equipment. The subscriber equipment can calculate new keys from time to time. The initial settings of scramblers can be modified as transmission modalities.

Abstract: For the receive-side clock supply for digital signals, such as digital data-compressed TV distribution signals, transmitted from a digital signal source, such as a TV signal source, via a connection unit and a light waveguide and/or coaxial line tree network connected thereto and respectively shared in common by a plurality of subscriber-side network termination units to the subscriber-side network termination units in the form of ATM signals, the required signal clock or clocks are separately transmitted at least proceeding from the connection unit to all network termination units connected to the light waveguide and/or coaxial line tree network. The digital signal acquired from the received ATM cells is thus time-regenerated thereat.

Abstract: For data security in a pay-TV system, a public key is respectively calculated from a secret key prescribed for pay-TV receiver by A program purveyor. This public key is utilized in the program distribution center for encoding secondary key information for matching the pay-TV receiver to transmission modalities that are repeatedly modified and that are provided for the pay-TV receiver in the program distribution center. The program purveyor can prescribe new keys from time to time. The initial settings of scramblers and descramblers can be modified as transmission modalities.

Abstract: The exemplary embodiment may be used for television (TV) signals and, if desired, also for radio, digital telephone, picture screen text and/or television telephone signals. For the reduction of the circuit-technical outlay of the actual broad band switching network, each TV program (Pl . . . Pp) is multiply supplied to a program-individual input (El . . . Ep) of the broad band switching network in time-division multiplex in a plurality of time channels; via the broad band switching network, each subscriber (Tq . . . Tt) has simultaneous access in the plurality of time channels to a corresponding plurality of programs (Pl . . . Pp). In the broad band switching network, the individual program signal sources (Pl . . . Pp) are respectively connected to coupling point switches belonging to the respective input (El . . .