Abstract: The invention relates to a switching system for a broadband ISDN-network by means of which signals can be transmitted with a large variety of bit rates. In addition to 64 kbit/s, 144 kbit/s and 2 Mbit/s narrow-band channels for inter alia telephony, data, video-information broadband channels for, for example, broadcast-TV having bit rates from 35-70 Mbit/s are switched through. For both signal catagories, a common switching system of the TST-type is utilised, which avoids the necessity of providing a multiplexer for each subscriber. The control of the time switching stages and the space switching stage forming part of the switching system is divided in a control for the broadband channels and a control for the narrow-band channels. Thus, a simple, effective control of the switching system is realised which operates at a low rate whenever possible.

Abstract: If in a broadband switching system broadcast TV-signals are switched, then it should be preferred that they can be switched through without the risk of blocking. To achieve this it is proposed to distribute the broadcast TV-signals via a p-fold bus line (BUS.sub.1, . . . BUS.sub.64) over the 64 inputs (DTV.sub.1, . . . DTV.sub.64) of the information stores IM.sub.1, IM.sub.2, . . . IM.sub.256. Together with their associated addressing and control, these information stores IM constitute a T-type T-stage switching system. Multiplex signals coming, for example, from the series-parallel converters SPT.sub.1, SPT.sub.2, . . . of an S-stage of a TST switching system are applied to the further, for example 36, inputs (I.sub.out,1, . . . I.sub.out,36) of each information store IM. By the action of the time slot control and the addressing associated with each information store IM 36 of the 100 memory locations are read and the contents are applied to the subscribers via outgoing multiplex line OMT.