IT1149255B - INTERCOMMUNICATION SYSTEM - Google Patents

INTERCOMMUNICATION SYSTEM

Info

Publication number
IT1149255B
IT1149255B IT24872/80A IT2487280A IT1149255B IT 1149255 B IT1149255 B IT 1149255B IT 24872/80 A IT24872/80 A IT 24872/80A IT 2487280 A IT2487280 A IT 2487280A IT 1149255 B IT1149255 B IT 1149255B
Authority
IT
Italy
Prior art keywords
intercommunication system
intercommunication
Prior art date
Application number
IT24872/80A
Other languages
Italian (it)
Other versions
IT8024872A0 (en
Inventor
Avontuur Petrus Dingeman
Der Bend Adrianus Gerardus Van
Original Assignee
Ericsson Telefon Mij
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 Telefon Mij filed Critical Ericsson Telefon Mij
Publication of IT8024872A0 publication Critical patent/IT8024872A0/en
Application granted granted Critical
Publication of IT1149255B publication Critical patent/IT1149255B/en

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
IT24872/80A 1979-09-25 1980-09-24 INTERCOMMUNICATION SYSTEM IT1149255B (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
IT8024872A0 IT8024872A0 (en) 1980-09-24
IT1149255B true IT1149255B (en) 1986-12-03

Family

ID=19833910

Family Applications (1)

Application Number Title Priority Date Filing Date
IT24872/80A IT1149255B (en) 1979-09-25 1980-09-24 INTERCOMMUNICATION SYSTEM

Country Status (10)

Country Link
AU (1) AU6265780A (en)
DK (1) DK403980A (en)
ES (1) ES495348A0 (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
DK403980A (en) 1981-03-26
AU6265780A (en) 1981-04-09
IT8024872A0 (en) 1980-09-24
ES8105913A1 (en) 1981-06-16
GB2060316A (en) 1981-04-29
FI802986A (en) 1981-03-26
NO802825L (en) 1981-03-26
NL7907134A (en) 1981-03-27
ES495348A0 (en) 1981-06-16
SE8006662L (en) 1981-03-26
FR2466161A1 (en) 1981-03-27

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