GB566445A - Improvements relating to searching arrangements in telephone systems - Google Patents

Improvements relating to searching arrangements in telephone systems

Info

Publication number
GB566445A
GB566445A GB13187/43A GB1318743A GB566445A GB 566445 A GB566445 A GB 566445A GB 13187/43 A GB13187/43 A GB 13187/43A GB 1318743 A GB1318743 A GB 1318743A GB 566445 A GB566445 A GB 566445A
Authority
GB
United Kingdom
Prior art keywords
relays
row
outlets
idle
column
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
GB13187/43A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and 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
Application filed by Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB13187/43A priority Critical patent/GB566445A/en
Priority to US547875A priority patent/US2434989A/en
Publication of GB566445A publication Critical patent/GB566445A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Testing Relating To Insulation (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

566,445. Automatic exchange systems. SIEMENS BROS. & CO., Ltd., and CHRISTIAN, D. A. Aug. 13, 1943, No. 13187. [Class 40 (iv)] In an arrangement for selecting an idle one of a group of outlets each of which is associated with a grid-controlled gas-discharge tube, a number of outlets are tested simultaneously and the relays for responding to the ignition of the tubes are connected in a chain circuit so that only one output is selected. In Fig. 1, the tubes GT are arranged in rows and columns, with row relays VA, VB ... connected to the cathodes and column relays HA, HB ... to the anodes, the latter relays being in a chain circuit. An idle outlet is indicated by positive grid potential and the outlets of each row are tested simultaneously by the application of a starting potential to all the tubes of the row. If the row contains no idle outlet, the build-up of potential on a condenser QA ignites a pilot tube PT and operates a relay LA, LB ... to transfer the starting potential to the next row. When there are idle outlets in a row, the column relay connected to the earliest ignited tube energizes in series with the row relay and disconnects the later column relays. The operated relays indicate the selected outlet to an operator or to a selector switch, e.g. a cross-bar switch. The search may be repeated if no idle outlet is found. Instead of serving one large group of outlets, the tubes may be divided between several smaller groups, not necessarily of the same size, there being a separate starting circuit for each group. In Fig. 4, all the outlets of a group are tested simultaneously, the row relays VA, VB ... as well as the column relays HA, HB being connected in a chain circuit so that only one can be operative at a time. When the row relay of the earliest row containing idle outlets operates, it locks in series with relay E which disconnects the earlier row relays and prepares the circuit for the column relays. Relays HA, HB ... have separate locking circuits and control identifying circuits over a chain of contacts so that an outlet subsequently becoming idle in an earlier column produces no effect. The starting potential is applied over a stepping switch in order that the search may be restricted to one or more rows when required.
GB13187/43A 1943-08-13 1943-08-13 Improvements relating to searching arrangements in telephone systems Expired GB566445A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB13187/43A GB566445A (en) 1943-08-13 1943-08-13 Improvements relating to searching arrangements in telephone systems
US547875A US2434989A (en) 1943-08-13 1944-08-03 High-speed searcher using gas discharge tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13187/43A GB566445A (en) 1943-08-13 1943-08-13 Improvements relating to searching arrangements in telephone systems

Publications (1)

Publication Number Publication Date
GB566445A true GB566445A (en) 1944-12-29

Family

ID=10018427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13187/43A Expired GB566445A (en) 1943-08-13 1943-08-13 Improvements relating to searching arrangements in telephone systems

Country Status (2)

Country Link
US (1) US2434989A (en)
GB (1) GB566445A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666809A (en) * 1947-10-27 1954-01-19 Flowers Thomas Harold Electrical switching system
DE921457C (en) * 1951-05-19 1954-12-20 Siemens Ag Circuit arrangement for checking the occupancy status of a group of lines, especially in telephone systems with dialer operation

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR973819A (en) * 1947-10-29 1951-02-15
US2619548A (en) * 1948-05-15 1952-11-25 Int Standard Electric Corp Electronic switching apparatus for telephone systems
US2541932A (en) * 1948-05-19 1951-02-13 Bell Telephone Labor Inc Multiplex speech interpolation system
US2609454A (en) * 1948-06-29 1952-09-02 Bell Telephone Labor Inc Selecting and lockout circuit
US2562100A (en) * 1948-11-17 1951-07-24 Bell Telephone Labor Inc Coordinate selecting and lock-out circuit
US2697140A (en) * 1949-12-20 1954-12-14 Bell Telephone Labor Inc Electronic testing system
US2691151A (en) * 1950-05-22 1954-10-05 Products & Licensing Corp Multiple switching systems
US2629020A (en) * 1950-12-19 1953-02-17 Bell Telephone Labor Inc Coordinate selecting and lock-out circuit for interpolated speech transmission
NL80837C (en) * 1951-05-23
US2892182A (en) * 1954-02-01 1959-06-23 Cons Electrodynamics Corp Register for digital information
US2901547A (en) * 1955-06-28 1959-08-25 Bell Telephone Labor Inc Switching system network
FR1172446A (en) * 1957-04-04 1959-02-10 Cie Ind Des Telephones Electronic locking selection device
US3064237A (en) * 1958-04-30 1962-11-13 Westinghouse Electric Corp Channel selector
US3175189A (en) * 1960-06-06 1965-03-23 Motorola Inc Random sequence switching system with lockout means
US3147464A (en) * 1961-10-16 1964-09-01 Warren L Spielman First-out annunclator having input and supply control of indicator switching means

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE640743C (en) * 1933-01-18 1937-01-14 Siemens & Halske Akt Ges Circuit arrangement for telecommunication, especially for telephone systems with call seekers
US2023589A (en) * 1934-05-26 1935-12-10 Bell Telephone Labor Inc Switching mechanism
US2235153A (en) * 1939-07-11 1941-03-18 Bell Telephone Labor Inc Chain start circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666809A (en) * 1947-10-27 1954-01-19 Flowers Thomas Harold Electrical switching system
DE921457C (en) * 1951-05-19 1954-12-20 Siemens Ag Circuit arrangement for checking the occupancy status of a group of lines, especially in telephone systems with dialer operation

Also Published As

Publication number Publication date
US2434989A (en) 1948-01-27

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