FR2379205A1 - INTERCOM INSTALLATION - Google Patents

INTERCOM INSTALLATION

Info

Publication number
FR2379205A1
FR2379205A1 FR7720986A FR7720986A FR2379205A1 FR 2379205 A1 FR2379205 A1 FR 2379205A1 FR 7720986 A FR7720986 A FR 7720986A FR 7720986 A FR7720986 A FR 7720986A FR 2379205 A1 FR2379205 A1 FR 2379205A1
Authority
FR
France
Prior art keywords
cit
lnc
intercom system
extension
intercom installation
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.)
Granted
Application number
FR7720986A
Other languages
French (fr)
Other versions
FR2379205B1 (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.)
FREIBOGEN ANSTALT
Original Assignee
FREIBOGEN ANSTALT
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 FREIBOGEN ANSTALT filed Critical FREIBOGEN ANSTALT
Publication of FR2379205A1 publication Critical patent/FR2379205A1/en
Application granted granted Critical
Publication of FR2379205B1 publication Critical patent/FR2379205B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

In the intercom system, which serves in particular for use as a door intercom system, groups in each case comprising n = 22 extensions (CIT 1/1, CIT n/1, CIT 1/2, CIT n/2) are connected, each group being connected via only two common wires (LNC, LN/1; LNC, LN/2) to the main station (left side of the figure). This is possible because the called extension is selected by adding the half-waves of a ringing and actuation frequency, a characteristic frequency being allocated to each extension (CIT).
FR7720986A 1977-01-27 1977-07-07 INTERCOM INSTALLATION Granted FR2379205A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH104077A CH614578A5 (en) 1977-01-27 1977-01-27 Intercom system, in particular for use as a door intercom system

Publications (2)

Publication Number Publication Date
FR2379205A1 true FR2379205A1 (en) 1978-08-25
FR2379205B1 FR2379205B1 (en) 1984-05-04

Family

ID=4201051

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7720986A Granted FR2379205A1 (en) 1977-01-27 1977-07-07 INTERCOM INSTALLATION

Country Status (5)

Country Link
CH (1) CH614578A5 (en)
DE (1) DE2729469C2 (en)
ES (1) ES457209A1 (en)
FR (1) FR2379205A1 (en)
IT (1) IT1077978B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665116A (en) * 1969-12-19 1972-05-23 Fasco Industries Apartment house intercom system
FR2113710A5 (en) * 1970-11-10 1972-06-23 Citovox
DE2409393A1 (en) * 1974-02-27 1975-08-28 Siemens Ag Telephone system installed at entrance to block of flats - has number of flat extensions reachable from entrance station
US3978468A (en) * 1974-11-11 1976-08-31 Robert F. Moore Intercom call signaling mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665116A (en) * 1969-12-19 1972-05-23 Fasco Industries Apartment house intercom system
FR2113710A5 (en) * 1970-11-10 1972-06-23 Citovox
DE2409393A1 (en) * 1974-02-27 1975-08-28 Siemens Ag Telephone system installed at entrance to block of flats - has number of flat extensions reachable from entrance station
US3978468A (en) * 1974-11-11 1976-08-31 Robert F. Moore Intercom call signaling mechanism

Also Published As

Publication number Publication date
DE2729469A1 (en) 1978-08-03
IT1077978B (en) 1985-05-08
CH614578A5 (en) 1979-11-30
DE2729469C2 (en) 1986-04-24
ES457209A1 (en) 1978-02-01
FR2379205B1 (en) 1984-05-04

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Legal Events

Date Code Title Description
ST Notification of lapse