NO920905D0 - KEY-CONTROLLED HIGH-SPEAKING PHONE SYSTEM WITH LINE SELECTION - Google Patents

KEY-CONTROLLED HIGH-SPEAKING PHONE SYSTEM WITH LINE SELECTION

Info

Publication number
NO920905D0
NO920905D0 NO920905A NO920905A NO920905D0 NO 920905 D0 NO920905 D0 NO 920905D0 NO 920905 A NO920905 A NO 920905A NO 920905 A NO920905 A NO 920905A NO 920905 D0 NO920905 D0 NO 920905D0
Authority
NO
Norway
Prior art keywords
central station
signals
key
busy
line selection
Prior art date
Application number
NO920905A
Other languages
Norwegian (no)
Other versions
NO920905L (en
NO307729B1 (en
Inventor
Friedrich Schulte
Martin Kemmerling
Original Assignee
Fraunhofer Ges Forschung
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Ges Forschung filed Critical Fraunhofer Ges Forschung
Publication of NO920905D0 publication Critical patent/NO920905D0/en
Publication of NO920905L publication Critical patent/NO920905L/en
Publication of NO307729B1 publication Critical patent/NO307729B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/008—Multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Telephone Set Structure (AREA)

Abstract

A key-controlled simplex or duplex intercom system with line selection. A plurality of subscriber devices are connected to a central station. The through-connection of the call and connection paths and the identification of the busy status of the subscriber devices are controlled by means of a switching computer disposed in the central station. The subscriber devices are connected to the central station via a digital serial transmission path, via which central station the control signals and the busy-status signals as well as the speech signals are transmitted in digital form in time division multiplexing. The channel structure of the transmission path has two B-channels, each with a transmission speed of 64 kbit/s in each direction, and a D-channel with a transmission speed of 16 kbit/s. All speech signals are transmitted via the two B-channels and all control signals and the busy-status signals are transmitted via the D-channel. <IMAGE>
NO920905A 1991-03-09 1992-03-06 Keypad speakerphone system with line selection NO307729B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4107591A DE4107591C1 (en) 1991-03-09 1991-03-09

Publications (3)

Publication Number Publication Date
NO920905D0 true NO920905D0 (en) 1992-03-06
NO920905L NO920905L (en) 1992-09-10
NO307729B1 NO307729B1 (en) 2000-05-15

Family

ID=6426863

Family Applications (1)

Application Number Title Priority Date Filing Date
NO920905A NO307729B1 (en) 1991-03-09 1992-03-06 Keypad speakerphone system with line selection

Country Status (5)

Country Link
EP (1) EP0503412B1 (en)
AT (1) ATE175830T1 (en)
DE (2) DE4107591C1 (en)
ES (1) ES2127733T3 (en)
NO (1) NO307729B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19523980C1 (en) * 1995-06-30 1997-01-02 Nca Mikroelektronic Gmbh Method for monitoring objects via a remote data transmission line

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837950C2 (en) * 1978-08-31 1986-11-13 Neumann Elektronik GmbH, 4330 Mülheim Switching device for a button-controlled exchange, counter or loudspeaker system
DE3000858C2 (en) * 1980-01-11 1986-11-13 Neumann Elektronik GmbH, 4330 Mülheim Button-controlled exchange, counter or loudspeaker system
DE3214656C2 (en) * 1982-04-21 1985-02-14 ANT Nachrichtentechnik GmbH, 7150 Backnang Control device for an intercom
JPS6482794A (en) * 1987-09-24 1989-03-28 Nec Corp Digital key telephone set
US4850011A (en) * 1988-01-13 1989-07-18 Redcom Laboratories, Inc. Key telephone system providing selection of key or PBX operational modes
US4873717A (en) * 1988-06-14 1989-10-10 American Telephone And Telegraph Company, At&T Bell Laboratories Call coverage arrangement
DE59007574D1 (en) * 1990-08-23 1994-12-01 Siemens Ag Digital telephone system.

Also Published As

Publication number Publication date
DE4107591C1 (en) 1992-03-05
DE59209612D1 (en) 1999-02-25
NO920905L (en) 1992-09-10
EP0503412A2 (en) 1992-09-16
ATE175830T1 (en) 1999-01-15
ES2127733T3 (en) 1999-05-01
EP0503412A3 (en) 1995-07-19
EP0503412B1 (en) 1999-01-13
NO307729B1 (en) 2000-05-15

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Legal Events

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MM1K Lapsed by not paying the annual fees