Abstract: A digital time division multiplex (TDM) telecommunication network is described wherein subscriber terminals are connected to a closed TDM loop which forms branch loops appropriately routed to remote subscriber groups or network sections. The branch loops may be bypassed by a connecting device in the event of a fault.

Abstract: A process for operating a digital T.D.M. telecommunications network for long distance traffic in which, on the wide band transmission lengths which connect the exchanges there are transmitted information blocks which each comprise items of information emanating from subscriber groups and which can be identified either by a preceding block address or by the sequence of their occurrence. At least in the case of individual main transmission links which connect two main exchanges there are formed one or more branch stations at which information blocks intended for a further exchange are emitted or information blocks emitting from the exchange are received, and the information blocks are switched at a specific number of the two main exchanges connected by the main transmission link and therefore always pass through.

Abstract: A digital time division multiplex (TDM) telecommunication network is described wherein the subscriber terminals are located on a common TDM highway and are served from a central office in accordance with the sequencing principle. The flow of information can be switched on branch routes using branching switching devices, a fixed sequence being adhered to in this case, as well.

Abstract: A digital time division multiplex communication network wherein the subscriber terminals are disposed in a fixed order on a TDM trunk going out from and ending in the terminal exchange is described. The data intended for the subscriber terminals are sent out by the terminal exchange together with an unmodulated carrier byte in the order of the connection of the subscriber terminals. After receiving the information intended therefor and after modulation of the carrier byte with the information to be supplied, the subscriber terminals are no longer capable of reception until the next pulse frame. The carrier bytes sent which are transmitted further and now modulated pass without hindrance through succeeding subscriber terminals.

Abstract: A PCM time division multiplex communication network is disclosed having a central processing office and digital subscriber stations. A special code word is prefixed to the PCM data sent by the central processing office to designate the intended subscriber station. While only the designated subscriber station is capable of accepting the PCM data, other subscriber stations are capable of amplifying and passing on the PCM data to the next subscriber station. Specifically, the invention is directed to a method and apparatus for transmitting PCM data wherein no special means are provided in the subscriber stations for synchronization while at the same time no increase in the bandwidth of the transmission signal is necessary. This is accomplished by using the PCM data accepted by a subscriber station as the carrier for the output information of the subscriber station.

Abstract: A method of operating pulse code modulated time division multiplex networks in which the subscriber stations participating in a connection receive the information intended for them on the basis of an interpretation of their respective address. The address is transmitted from the sending end exchange in conjunction with the message signals. The message signals to be transmitted are produced from a given subscriber station responsive to that subscriber station receiving its own address transmitted from the terminal exchange in the time slot allocated to the connection in question. This occurs while the subscriber stations modulate and relay in the direction of transmission the unmodulated byte received after their addresses in accordance with the message signals to be delivered by them.