System for the simultaneous operation of a plurality of terminal equipment at a network terminating unit of a broadband network

Claim 1

System for the simultaneous operation of a plural number of terminal equipments (TE) by means of bit currents at a network terminating unit (NT), which has a receiver (4) which receives signals from a common D-channel of different terminal equipment (TE), characterized in that: a. a loop-shaped bus having an outgoing direction portion and an incoming direction portion and extending between said terminating unit (NT) and said terminal equipments, a single bus line for connecting said terminal equipments with said network terminating unit (NT) and terminated in low-reflection fashion at its end, a plurality of equipment connector lines each connected to one of said terminal equipments (TE) and branched off from said loop-shaped bus line and said single bus line so as to provide identical signal transit times; b. said terminal equipment generating signals in respective time slots and data bit streams flowing from or, respectively, to said terminal equipment are combined using a time-division multiplex super-frame containing two ISDN narrow band channels B1 and B2 which is transmitted with the standard bit rate of the fourth PCM hierarchy level of 139.264 Mbit/s, said super frame being composed so that when it is transmitted in both incoming and outgoing directions two frames will each contain a complete picture line and each frame comprises 8704 bit including 8 bits for said two ISDN narrow-band channels B1 and B2 and data and wherein synchronization bits are contained for the frame synchronization or, respectively, segment synchronization (Vor); c. the frame of data transmitted in said outgoing direction is shifted by 80% of the frame duration to the frame of data transmitted in said incoming direction and contains a pre-span interval between the signals from various sources which arrive at said receiver of the network terminating unit (NT) with different phase relations, said pre-span interval being synchronization bit pattern; d. for the purpose of unambiguously recognizing overlaying pulses from different sources which are active at the same time, D-channel signalling bit transmitted at the frame start from said terminal equipment (TE) to said network terminating unit (NT) is expanded by at least 10 times and is coded in pseudoternary fashion.