GB566779A - Improvements in electrical signalling systems - Google Patents

Improvements in electrical signalling systems

Info

Publication number
GB566779A
GB566779A GB11075/43A GB1107543A GB566779A GB 566779 A GB566779 A GB 566779A GB 11075/43 A GB11075/43 A GB 11075/43A GB 1107543 A GB1107543 A GB 1107543A GB 566779 A GB566779 A GB 566779A
Authority
GB
United Kingdom
Prior art keywords
switch
key
line
contacts
tone
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
GB11075/43A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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
Priority to NL63260D priority Critical patent/NL63260C/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB11075/43A priority patent/GB566779A/en
Priority to US537564A priority patent/US2421169A/en
Priority to ES0166712A priority patent/ES166712A1/en
Publication of GB566779A publication Critical patent/GB566779A/en
Priority to FR932188D priority patent/FR932188A/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
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/12—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in shaft furnaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

566,779. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., BAKER, G. T., and TAYLOR, R. July 8, 1943, No. 11075. [Class 40 (iv)] A selector is started by a subscriber who receives an audible signal at each step and stops it in the appropriate position. In the ten-line P.A.X. shown, the subscribers have voice-powered transmitters and a key PB1 on the hand-set for bridging the line wires. A call is initiated by operating this key, whereupon line relay C steps the forward-drive switch SS one step off normal and so energizes H. The key is then released, C falls and H holds momentarily over pulse wire IPL and then connects this wire to the stepping magnet SSM over the off-normal bank. At each step, a tone signal is given from wire ITL which receives pulses of tone current synchronous with the driving pulses on IPL from a neon tube generator. When the switch has made the desired number of steps, the key is operated again and C pulls up to stop it. If the line is idle, H pulls up also over the zero contact of the wanted line in series with H of the wanted circuit and the latter connects up calling tone from CTL. When the subscriber replies, his relay C moves his switch one step off-normal to cut off the calling tone. If the line is busy, H is unoperated and the caller continues to hear the tone signals. At the end of a conversation or when the call is abandoned, the key contacts are opened again and the switch is stepped on to its home position. It can be stopped if desired before reaching this position by re-operating the key. One of the switch positions may be devoted to a conference circuit. Subscribers are given the facility of breaking in on busy lines by bridging their h3 contacts. A non-linear resistance shunt, e.g. a dry rectifier, may be put across the receiver to prevent its actuation by the calling tone, the calling signal in this case being given out by the transmitter. In a modification, the key contacts PB1 are replaced by cradle switch contacts and a further switch on the hand-set with its contacts normally closed is used to give the temporary interruption necessary to drive the switch to the wanted line. The invention is stated to be applicable to larger systems.
GB11075/43A 1943-07-08 1943-07-08 Improvements in electrical signalling systems Expired GB566779A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL63260D NL63260C (en) 1943-07-08
GB11075/43A GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems
US537564A US2421169A (en) 1943-07-08 1944-05-27 Automatic telephone system directed with the aid of revertive audio-frequency signals
ES0166712A ES166712A1 (en) 1943-07-08 1944-06-30 A TELEPHONE OR SIMILAR SIGNAL SYSTEM
FR932188D FR932188A (en) 1943-07-08 1946-08-12 Improvements to electrical transmission devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11075/43A GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems

Publications (1)

Publication Number Publication Date
GB566779A true GB566779A (en) 1945-01-12

Family

ID=9979556

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11075/43A Expired GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems

Country Status (5)

Country Link
US (1) US2421169A (en)
ES (1) ES166712A1 (en)
FR (1) FR932188A (en)
GB (1) GB566779A (en)
NL (1) NL63260C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB575294A (en) * 1944-01-12 1946-02-12 Automatic Telephone & Elect Improvements in or relating to telephone systems
US2623164A (en) * 1948-11-01 1952-12-23 Automatic Elect Lab Single channel, single frequency, mobile radio telephone system
US2740841A (en) * 1953-01-16 1956-04-03 Itt Automatic rural crossbar switching system
US3234514A (en) * 1958-12-12 1966-02-08 Int Standard Electric Corp Electric pulse signalling system having switching means connected to a constant-voltage source
DE1762060A1 (en) * 1967-03-31 1970-04-30 Nippon Electric Co Inter-trunk dialing system for a telephone switched network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1137223A (en) * 1914-03-02 1915-04-27 Western Electric Co Machine telephone switching system.
US1367583A (en) * 1918-04-02 1921-02-08 Bornett L Bobroff System for signaling
US1600358A (en) * 1923-12-27 1926-09-21 Coventry Autom Telephones Ltd Remote-control system
US1778077A (en) * 1924-10-11 1930-10-14 American Telephone & Telegraph Remote-control system

Also Published As

Publication number Publication date
ES166712A1 (en) 1944-08-16
NL63260C (en)
FR932188A (en) 1948-03-15
US2421169A (en) 1947-05-27

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