Service integrated communication transmission and interchange system

• US 4,441,180 A
• Filed: 05/30/1980
• Issued: 04/03/1984
• Est. Priority Date: 06/01/1979
• Status: Expired due to Term

• Current Assignee: Licentia Patent-Verwaltungs-GmbH
• Original Assignee: Licentia Patent-Verwaltungs-GmbH
• Inventors: Schussler, Hans
• Primary Examiner(s): ORSINO JR, JOSEPH
• Application Number:
  US06/155,132
• Time in Patent Office: 1,404 Days
• Field of Search: 370/1, 370/3, 370/4, 455/612, 455/606, 455/607, 358/86, 358/85
• US Class Current: 398/75
• CPC Class Codes: H04B 10/25891 Transmission components H04B10/40 takes precedence
• CPC Class Codes: H04H 20/81 combined with telephone network over which the broadcast is continuously available
• CPC Class Codes: H04J 2203/0028 Local loop
• CPC Class Codes: H04M 11/068 using time division multiplex techniques; integrated services digital networks H04Q11/0428
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A service integrated communications transmission and switching system for audio, video and data, between a user terminal and a central switching station of a telephone system wherein the line connecting the user terminal with the switching station includes at most one light-conductive fiber which is utilized in wave multiplex duplex operation for the transmission and reception of signals from and to the user terminal; the narrowband services are provided by means of digital transmission with analog to digital and digital to analog conversion and multiplex and demultiplex taking place at the user end; and the broadband services are provided by means of analog transmission.

Claims

1. In a service integrated communications transmission and switching system for audio, video and data between a user terminal and a local switching station of a telephone system wherein said user terminal includes, in addition to a telephone device with an associated code converter for the transmission and reception of telephone signals in digital form, at least one device for a narrowband service for digital data and at least one device for a broadband service with analog data signals such as video or audio broadcasting, and wherein means are provided for connecting said user terminal to said local switching station so that signals may be transmitted in both directions between said user terminal and said local switching station, the improvement wherein:

said means for connecting said user terminal to said local station comprises a single light-conductive fiber having one end connected to said user terminal, and a preliminary field concentration means, connected between the other end of said single light-conductive fiber and said local switching station, for connecting signals from and to a plurality of user terminals to said local switching station;

said user terminal includes respective means connected to said light-conductive fiber for transmitting and receiving an optical carrier signal modulated with the data to be transmitted via said light-conductive fiber in wave multiplex duplex operation, with said means for transmitting and receiving an optical signal at said user terminal receiving only a modulated optical signal in a first optical region and transmitting only an optical signal in a second optical region; and

said concentrator means includes;

first means for coupling signals to be transmitted to said user terminal and decoupling received signals from said user terminal to and from said light-conductive fiber;

second means, connected to said first means, for separating analog signals for said broadband services and digital signals for said narrowband and telephone services received from said user terminal into the individual services and for combining analog and digital signals to be transmitted to said user terminal in said first optical region;

third means, connected between said second means and said local station, for time multiplexing digital signals for said narrowband and telephone services received from said second means and for transmitting these signals to said local station, and for time demultiplexing digital signals for said narrowband and telephone services received from said local station and supplying the time demultiplexed signals to said second means for transmission to said user terminal; and

fourth means, connected to said second means, and for directly establishing a connection for the analog signals for said broadband services between said user terminal and said local station by switching in space multiplex.

2. A system as defined in claim 1 wherein said single optical fiber is a gradient fiber.

3. A system as defined in claim 1 wherein semiconductor coupling elements are used to switch said analog signals for said broadband services.

4. A system as defined in claim 1 including a plurality of said concentrators and wherein a light-conductive system is used for the data connections between said plurality of said concentrators.

5. A system as defined in claim 1 including a plurality of said switching stations and wherein a light-conductive system is used for the data connections between said plurality of switching stations.

6. A system as defined in claim 1 wherein a light-conductive system is used for the data connections between said concentrator and said switching station.

7. A system as defined in claim 1 or 6 wherein:

said system is provided with broadband radio channels in at least one broadcast band for transmission to said user terminal, with a narrowband digital information control channel for transmission from said user terminal to said central switching station, and with a telephone channel, a signaling channel and narrowband service channels for transmission in both directions.