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Digital time-division multiplex telecommunication system
| Details |
Inventors: Schulze, Elmar;
Assignee:
Primary Examiner: Safourek; Benedict V.
Assistant Examiner:
Attorney, Agent or Firm: Smith, Jr.; John C.
A digital time-division multiplex telecommunication system of flexible network configuration, including line, branch, ring, and star networks. Decentralized control of channel assignment is provided. Branching nodes coupling subscriber stations into bidirectional transmission lines are provided. The branching nodes comprise decentralized control means for confining communication connections between two subscribers to occupy transmission channels only on those portions of the transmission lines between the two subscribers. Thus, channels used by the two subscribers are free for use between subscribers whose connection path does not overlay that of the two subscribers. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a digital time-division multiplex telecommunication system in which the number of transmission channels required by a plurality of subscribers in the network for handling narrow-band and/or wide-band services is reduced in order to increase the number of subscriber stations, which can be present in a network for a given transmission bit rate, to a corresponding extent.
Another object of the present invention resides in a digital time-division multiplex telecommunication system in which the reliablity of the system with respect to breaks in the two-wire network or system component failures is increased and the telecommunication system is provided with improved protection against interception of calls with respect to other multiple-access systems, while simultaneously the network structure of the telecommunication system is provided with a modular configuration and greater flexibility.
According to the invention, the desired properties of the telecommunication system are achieved by a directional transmission of the messages over the shortest path between the communicating subscribers, by multiple utilization of a transmission channel for simultaneous independent connections and by time-position addressing of the messages.
To this end, the branching nodes inserted into the line network for message input and output purposes must perform a message directing function.
According to the invention, multiple utilization of a message channel is made possible for several simultaneous independent connections, and thus an increased channel utilization with directional message transmission and time-position addressing of the message blocks.
As a rule, each section of the network of conductors, that is to say each path of the two-wire lines between two branching nodes, presents a different state of channel occupancy.
For this reason it is important for the invention that a channel which is free through its whole length is found between two subscriber stations
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Telecommunications 
