DATA TRANSMISSION SYSTEM

• US 3,803,405 A
• Filed: 01/24/1972
• Issued: 04/09/1974
• Est. Priority Date: 10/09/1968
• Status: Expired due to Term

• Current Assignee: Horst Ohnsorge, Mandred Borner
• Original Assignee: Horst Ohnsorge, Mandred Borner
• Inventors: Ohnsorge, Horst, Borner, Mandred
• Primary Examiner(s): Blakeslee, Ralph D.
• Application Number:
  US05/220,009
• Time in Patent Office: 806 Days
• Field of Search: 179/15BA,15AL,15AT 178/DIG.2 250/199
• US Class Current: 398/100
• CPC Class Codes: H04J 14/005 Optical Code Multiplex
• CPC Class Codes: H04J 14/08 Time-division multiplex systems
• CPC Class Codes: H04J 3/24 in which the allocation is indicated by an address the different channels being transmitted sequentiallyH04J3/17 takes precedence; in computers G06F12/00, G06F13/00 code multiplex systems H04J13/00; selecting techniques H04Q; relay systems H04B7/14
• CPC Class Codes: H04J 3/26 in which the information and the address are simultaneously transmitted
• CPC Class Codes: H04M 9/025 Time division multiplex systems, e.g. loop systems

Abstract

A telephone network in which circuits at each user location monitor the entire data flow in which the individual messages are multiplexed and selects the message directed to that location on the basis of identifying data also transmitted as part of the data flow.

Claims

1. In a time multiplex multiple access data transmission system composed of a plurality of user locations connected to a common transmission medium at more than two different points thereof for transmitting messages, including address data, tHrough such medium, and multiplex means for multiplexing the individual messages for delivery to the transmission medium, the improvement wherein:

said medium comprises two transmission channels disposed parallel to one another;

each channel is composed of a series of optical fiber segments and a plurality of intermediate amplifiers connecting said segments together in series and each connected to a respective user location;

said amplifiers in one said channel are oriented to conduct signals in one direction while said amplifiers in the other said channel are oriented to conduct signals in the opposite direction; and

each said user location has an outgoing line connected to the input of its respective amplifier in at least the one said channel and an incoming line connected to the output of its respective amplifier in at least the other said channel; and

wherein said system further comprises means associated with each said location for monitoring the entire data flow through said medium and automatically selecting that data intended for said location.

2. An arrangement as defined in claim 1 wherein there are a plurality of said transmission media, and further comprising means defining a coupling point connected to both channels of each said medium for conducting all signals received from a respective channel of one said medium to those channels of the other said media which are arranged to conduct signals away from said coupling point.

3. An arrangement as defined in claim 2 wherein said transmission media are connected in the form of a star network.

4. A method for data transmission in a time multiplex multiple access data transmission system composed of a plurality of user locations connected to a common transmission medium at more than two different points thereof for transmitting messages through such medium, the method permitting data transmission between a calling user location and a called user location, said method comprising, in the framework of a telephone network without a central exchange, for each said user location, monitoring the entire flow of data for individual information intended for that user location, by reference to addresses contained in said flow of data;

and for each user location, transmitting according to a '"'"''"'"''"'"''"'"'Radas'"'"''"'"''"'"''"'"' like method by monitoring the entire existing data flow and introducing data into said transmission medium only during those time intervals when other users are not using said transmission medium in place of a fully asynchronous data transmission.

5. An arrangement as defined in claim 2 further comprising a non-reflecting load connected to each free end of each said channel.

6. A method as defined in claim 4 wherein user locations participating in a connection cease monitoring the remainder of said flow of data for the duration of said connection.

7. A method as defined in claim 4 wherein the finding of each said user location of its own address within the data flow trips a ringing signal.

8. A method as defined in claim 7 wherein each said calling user location monitors said flow of data as to whether the address of a user location to be called is already being transmitted, for determining the actuation of an engaged signal at said calling user location.

9. A method as defined in claim 8 wherein each said calling user location firstly seeks out a time gap within the flow of data, and after finding such a gap sends out a pulse sequences in a predetermined time interval.

10. A method as defined in claim 9 wherein, after termination of such time gap, said pulse sequences are replaced by a pulse sequence containing in succession the address of said called user location and the address of said calling user location, these said addresses being sent in rigid phase and frequency relation to said time gap.

11. A method as defined in claim 2 wherein the sending of said address of the calling user location is used as criterion for the actuation of a ringing tone.

12. A method as defined in claim 9 whereIn, when a connection is made, said called user location transmits the address of said calling user location away so that it is situated at a predetermined time interval from the address of said calling user location transmitted by said calling user location.

13. A method as defined in claim 12, wherein reception by said calling user location of the address of said calling user location transmitted by said called user location terminates the ringing tone, after a predetermined number of repetitions.

14. A method as defined in claim 13 wherein when a connection has been made, transmitted addresses are modulated with the data to be transmitted so that information for the called user location is contained in the time gap.

15. A method as defined in claim 4 wherein a light-conductor line is used as said transmission medium.