GB1004090A - A telephone system with sub-exchange - Google Patents

A telephone system with sub-exchange

Info

Publication number
GB1004090A
GB1004090A GB4177661A GB4177661A GB1004090A GB 1004090 A GB1004090 A GB 1004090A GB 4177661 A GB4177661 A GB 4177661A GB 4177661 A GB4177661 A GB 4177661A GB 1004090 A GB1004090 A GB 1004090A
Authority
GB
United Kingdom
Prior art keywords
exchange
concentrator
signal
signals
subscriber
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
GB4177661A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1004090A publication Critical patent/GB1004090A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

1,004,090. Automatic exchange systems. TELEFUNKEN. Nov. 22, 1961 [Nov. 26, 1960], No. 41776/61. Heading H4K. In a system in which switches at an exchange and at a concentrator are set to the same position dependent on the subscriber concerned, a signal identifying the subscriber is sent twice over the exchange line, the first time in the direction of the call, and the connection is established only if the two signals are identical. The signals may be sent in binary code form. Four alternatives arise for the second signal. It may be sent (1) in the same direction as the first, (2) in the reverse direction, (3) always from exchange to the concentrator, or (4) always from the concentrator to the exchange. In case (1), a preliminary seizing signal is necessary to avoid simultaneous sending of an identifying signal from both ends. In cases (1) and (4), since the comparison of signals on a call from the concentrator is made at the exchange, a subscriber barred from making outgoing calls is disabled by a signal from the exchange. In all cases a pilot tone may be employed to indicate when the connection has been made at the concentrator.
GB4177661A 1960-11-26 1961-11-22 A telephone system with sub-exchange Expired GB1004090A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET19337A DE1129550B (en) 1960-11-26 1960-11-26 Method for transmitting criteria for the setting of mutually assigned dialing devices in telecommunication systems, in particular telephone systems with apron systems

Publications (1)

Publication Number Publication Date
GB1004090A true GB1004090A (en) 1965-09-08

Family

ID=7549280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4177661A Expired GB1004090A (en) 1960-11-26 1961-11-22 A telephone system with sub-exchange

Country Status (3)

Country Link
CH (1) CH387709A (en)
DE (1) DE1129550B (en)
GB (1) GB1004090A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207301A (en) * 1987-05-29 1989-01-25 Teradyne Inc Probe for testing electronic components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207301A (en) * 1987-05-29 1989-01-25 Teradyne Inc Probe for testing electronic components

Also Published As

Publication number Publication date
CH387709A (en) 1965-02-15
DE1129550B (en) 1962-05-17

Similar Documents

Publication Publication Date Title
GB1013594A (en) Improvements in communication switching systems
GB932613A (en) Switching systems between multiplex communication channels
GB1043643A (en) Asymmetrical d.c. signalling system over two-wire telecommunication, particularly telephone lines
GB560807A (en) Improvements in telephone or like systems
GB1271548A (en) A communication system
GB1004090A (en) A telephone system with sub-exchange
GB1059535A (en) Intercommunication system with voice-frequency key dialling
GB1369670A (en) Communication systems
GB997229A (en) In-dialling circuit for a private branch exchange
GB1061162A (en) Improvements in or relating to p.a.b.x. telephone systems
GB1084099A (en)
GB1051505A (en)
GB1029204A (en) Improvements in or relating to telephone switching systems
GB1462003A (en) Telecommunication systems
GB1041757A (en) Improvements relating to automatic telephone exchange systems
GB1480221A (en) Telephone intercommunication systems
GB1043839A (en) Method to mark calls in telephone connections, equipped with automatic call transfer
GB1143667A (en)
GB1032966A (en) Private automatic branch exchanges
GB744872A (en) Improvements in house telephone systems
GB956037A (en) A circuit arrangement for use in an automatic telephone system
GB1364211A (en) Arrangement for testing two wire and four wire telephone lines
GB955569A (en) Circuit arrangement for a transmission system for sound events
GB1091153A (en) Ringing method for telephone systems
GB1264576A (en)