FR2290810A1 - Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier - Google Patents

Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier

Info

Publication number
FR2290810A1
FR2290810A1 FR7441040A FR7441040A FR2290810A1 FR 2290810 A1 FR2290810 A1 FR 2290810A1 FR 7441040 A FR7441040 A FR 7441040A FR 7441040 A FR7441040 A FR 7441040A FR 2290810 A1 FR2290810 A1 FR 2290810A1
Authority
FR
France
Prior art keywords
variable
switching
demodulation
line
variable capacity
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
FR7441040A
Other languages
French (fr)
Other versions
FR2290810B1 (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.)
TRESSENS ROGER
Original Assignee
TRESSENS ROGER
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 TRESSENS ROGER filed Critical TRESSENS ROGER
Priority to FR7441040A priority Critical patent/FR2290810A1/en
Publication of FR2290810A1 publication Critical patent/FR2290810A1/en
Application granted granted Critical
Publication of FR2290810B1 publication Critical patent/FR2290810B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/02—Selecting arrangements for multiplex systems for frequency-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radio Relay Systems (AREA)

Abstract

The electronic variable capacity switching system is used for telephone interconnection exchanges. The switching arrangement is connected to a common centre installation supplying subscriber sets by a single line common to the subscribers. This line is used to carry all control and speech signals. The centre contains all the switching groups together with automatic modulation and demodulation systems required to allow transmission of the signals to each subscriber set. An extendable ring counter works with a system of gates and electronic switches preventing cross coupling of lines. Each line has a carrier frequency modulated using a shift register, multiplexing system, oscillator, and a variable filter network.
FR7441040A 1974-11-07 1974-11-07 Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier Granted FR2290810A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7441040A FR2290810A1 (en) 1974-11-07 1974-11-07 Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7441040A FR2290810A1 (en) 1974-11-07 1974-11-07 Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier

Publications (2)

Publication Number Publication Date
FR2290810A1 true FR2290810A1 (en) 1976-06-04
FR2290810B1 FR2290810B1 (en) 1979-08-03

Family

ID=9146091

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7441040A Granted FR2290810A1 (en) 1974-11-07 1974-11-07 Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier

Country Status (1)

Country Link
FR (1) FR2290810A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607853A (en) * 1947-01-27 1952-08-19 British Telecomm Res Ltd Telecommunication system
US3475561A (en) * 1965-09-29 1969-10-28 Superior Continental Corp Telephone carrier system having selfcontained independently attachable line tap units

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607853A (en) * 1947-01-27 1952-08-19 British Telecomm Res Ltd Telecommunication system
US3475561A (en) * 1965-09-29 1969-10-28 Superior Continental Corp Telephone carrier system having selfcontained independently attachable line tap units

Also Published As

Publication number Publication date
FR2290810B1 (en) 1979-08-03

Similar Documents

Publication Publication Date Title
US3824597A (en) Data transmission network
US3809815A (en) Communication system utilizing frequency division multiplexing to link a plurality of stations each containing a switchable synthesizer
RU98104084A (en) BROADBAND DIGITAL SUBSCRIBER SYSTEMS
GB1476345A (en) Frequency division multiplex telephone system
US3261922A (en) Fdm data trunking system having a common tdm supervisory channel
US2440239A (en) Two-way carrier wave telephone system
US3083267A (en) Pcm telephone signaling
GB1444258A (en) Telephone systems
GB1506710A (en) Radio relay systems
US4031327A (en) Telephone set and system utilizing frequency division multiplexing
FR2290810A1 (en) Variable capacity automatic switching for telephone exchanges - involves automatic modulation and demodulation of variable carrier
ES427945A1 (en) Time division multiplex switching system
GB791933A (en) Improvements in or relating to telecommunication systems
FI60474B (en) MODULARING REQUIREMENTS FOR ADJUSTMENT OF TELEPHONE FREQUENCY MULTIPLEXSYSTEM
US2408462A (en) Telephone system
US1917960A (en) Four wire circuits
US4740967A (en) Dispersed switching telecommunication system
US2833861A (en) Communication sysem, intermediate relay repeater station
US3484557A (en) Supervisory signaling over radio-telephone system
GB1079515A (en) Limited capacity telephone system
ATE4363T1 (en) SYSTEM FOR THE WIRELESS TRANSMISSION OF TELEPHONE CALLS WITH A NUMBER OF RADIO CHANNELS LOWER THAN THE NUMBER OF SUBSCRIPTION STATIONS.
SE7505203L (en) TELECOMMUNICATIONS SYSTEM.
US4031326A (en) Telephone artery with multiple access points and telephone networks with such arteries
ES420189A1 (en) A circuit for the establishment of telephone connections. (Machine-translation by Google Translate, not legally binding)
GB1489741A (en) Telecommunication system networks

Legal Events

Date Code Title Description
ST Notification of lapse