Abstract: In a broad-band communications system, whose subscriber lines are preferably formed by light wave guides, and by way of which television broad-band signals are transmitted as pulse-modulated signals, for television program distribution, each television program is supplied, in a plurality of time channels, to time channel individual inputs in program source individual switching planes of a broad-band switching arrangement. In order to increase the blocking attenuation, crosspoint switches which lead to one and the same output are connected via multiplex logic linking elements to the output in question of the broad-band switching arrangement. When a crosspoint switch is blocked, the broad-band signal in question then experiences the cascaded blocking attenuation of a crosspoint switch and a threshold value multiplex circuit. The crosspoint switches and the threshold value multiplex circuits are preferably formed by logic linking elements constructed in accordance with ECL technology.

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 . . .

Abstract: In the exemplary embodiment, in order to reduce the load on the input signal sources, the individual inputs are respectively connected to the respectively appertaining coupling point switches via a fan-out arrangement of constantly unlocked ECL elements with a plurality of negating or, respectively, non-negating outputs. In order to take such negations into consideration, a respective half of the cross point switches are formed by means of AND gates and one respective half is formed by means of NOR gates.