ES8105913A1 - Intercom system - Google Patents

Intercom system

Info

Publication number
ES8105913A1
ES8105913A1 ES495348A ES495348A ES8105913A1 ES 8105913 A1 ES8105913 A1 ES 8105913A1 ES 495348 A ES495348 A ES 495348A ES 495348 A ES495348 A ES 495348A ES 8105913 A1 ES8105913 A1 ES 8105913A1
Authority
ES
Spain
Prior art keywords
processing unit
common
central office
office line
telephone sets
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES495348A
Other languages
Spanish (es)
Other versions
ES495348A0 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Telefoon Maatschappij NV
Original Assignee
Ericsson Telefoon Maatschappij NV
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 Ericsson Telefoon Maatschappij NV filed Critical Ericsson Telefoon Maatschappij NV
Publication of ES495348A0 publication Critical patent/ES495348A0/en
Publication of ES8105913A1 publication Critical patent/ES8105913A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • 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
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

An intercommunication system for use with at least two telephone sets, each connected through a four- wire (2 for speech, 2 for control signals) cable to a common processing unit located at the customer's premises. Each telephone set in addition to the conventional selecting means comprising a plurality of select keys equal in number to the maximum number of telephone sets for which said processing unit is designed for selectively calling through said processing unit by optical and audio signals any of the telephone sets for intercommunication through a common line, a central office line key for establishing a connection to a common central office line, and for taking over a call transferred from another telephone set of the system, and optical signal reproducing means. Said common processing unit being adapted to accomplish all the necessary switching and signalling functions for handling intercommunicating traffic and traffic through the central office line.
ES495348A 1979-09-25 1980-09-25 Intercom system Expired ES8105913A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7907134A NL7907134A (en) 1979-09-25 1979-09-25 TELEPHONE INSTALLATION OF THE TYPE INDICATED AS A STAR POINT INSTALLATION.

Publications (2)

Publication Number Publication Date
ES495348A0 ES495348A0 (en) 1981-06-16
ES8105913A1 true ES8105913A1 (en) 1981-06-16

Family

ID=19833910

Family Applications (1)

Application Number Title Priority Date Filing Date
ES495348A Expired ES8105913A1 (en) 1979-09-25 1980-09-25 Intercom system

Country Status (10)

Country Link
AU (1) AU6265780A (en)
DK (1) DK403980A (en)
ES (1) ES8105913A1 (en)
FI (1) FI802986A (en)
FR (1) FR2466161A1 (en)
GB (1) GB2060316A (en)
IT (1) IT1149255B (en)
NL (1) NL7907134A (en)
NO (1) NO802825L (en)
SE (1) SE8006662L (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3000858C2 (en) * 1980-01-11 1986-11-13 Neumann Elektronik GmbH, 4330 Mülheim Button-controlled exchange, counter or loudspeaker system
US4744103A (en) * 1985-11-27 1988-05-10 Rauland-Borg Corporation Computer controlled multi-link communication system
IN167984B (en) * 1986-09-23 1991-01-19 Siemens Ag
US4769837A (en) * 1987-05-04 1988-09-06 Eoa Systems, Inc. Device for adding intercom functions to a phone system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2139693B1 (en) * 1971-05-28 1973-05-25 Supravox Sarl
GB1369829A (en) * 1971-12-23 1974-10-09 Standard Telephones Cables Ltd Electric impulse transmitters
FR2285775A1 (en) * 1974-09-17 1976-04-16 Berna Guy Intercommunication system with selective calling - uses codes signals to alert slave stations branched from common line
US4088846A (en) * 1977-03-30 1978-05-09 Bell Telephone Laboratories, Incorporated Hold-plus-intercom for single-line stations

Also Published As

Publication number Publication date
NL7907134A (en) 1981-03-27
NO802825L (en) 1981-03-26
AU6265780A (en) 1981-04-09
ES495348A0 (en) 1981-06-16
FI802986A (en) 1981-03-26
IT1149255B (en) 1986-12-03
SE8006662L (en) 1981-03-26
FR2466161A1 (en) 1981-03-27
GB2060316A (en) 1981-04-29
DK403980A (en) 1981-03-26
IT8024872A0 (en) 1980-09-24

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