GB818491A - Connector and circuit arrangement for automatic telecommunication exchange system - Google Patents

Connector and circuit arrangement for automatic telecommunication exchange system

Info

Publication number
GB818491A
GB818491A GB3051555A GB3051555A GB818491A GB 818491 A GB818491 A GB 818491A GB 3051555 A GB3051555 A GB 3051555A GB 3051555 A GB3051555 A GB 3051555A GB 818491 A GB818491 A GB 818491A
Authority
GB
United Kingdom
Prior art keywords
digit
contacts
finger
magnet
sra
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
GB3051555A
Inventor
Benjamin Bertie Johnson
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.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing 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 Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Priority to GB3051555A priority Critical patent/GB818491A/en
Publication of GB818491A publication Critical patent/GB818491A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements
    • H04Q3/0008Selecting arrangements using relay selectors in the switching stages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F02D41/1456Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

818,491. Automatic exchange systems. TELEPHONE MANUFACTURING CO. Ltd. Oct. 15, 1956 [Oct. 25, 1955], No. 30515/55. Addition to 703,931. Class 40 (4). The parent Specification relates to the use of a pair of selective relay units, of the type described in Specification 689,735, in a connector responsive to a single digit. The disclosure in the parent Specification is now modified to make the connector responsive to either one or two digits. First embodiment, Fig. 1. Single digit 1-9. Closure of the loop energizes A, B and RF in sequence. At the first impulse A falls back to energize finger magnet FMA1 in the first selective relay unit unit SRA. FMA1 interposes its finger between the main armature AA and the contact card CA1. The main operating magnet EMA then pulls up over contacts rf2 and a1 to close the first set of contacts in SRA. At the end of the impulse A re-energizes to operate SW and restore FMA1, finger magnet FMB1 pulling up over the first contacts in level LAG which are held closed by EMA. At successive impulses the finger magnets of one or other unit SRA, SRB are thus operated in succession with alternate operation of main magnet EMA or EMB. At the end of the train A remains operated to maintain B so that CD falls back slowly to restore RF. If the wanted line is free its test conductor presents battery to level LAE or LBE to operate H. Contacts h2, h3 connect up the ringing circuit. When the called subscriber answers F energizes to cut off the ringing and connect up the speech path. Release is effected when both parties hang up. Calling a two-digit number. The first digit of a two-digit number is 0. The tenth impulse actuates the fifth bank of contacts in SRB. Circuit is made over level LBG to operate CH which switches the incoming line from levels LAA, LAC, LAE to levels LAB, LAD, LAF. The second digit 1-9 then selects a subscriber's line 01-09 in a manner similar to that described for lines 1-9. Second embodiment. The circuit shown in Fig. 1 can be converted to that shown in Fig. 2 which makes use of a third selective relay unit SRC and can handle calls to any one of 28 lines. A single digit 1-7 or 9 produces progressive energization of finger magnets and alternate energization of main magnets EMA, EMB in the manner described in connection with Fig. 1. At each closure of a bank of contacts in SRA or SRB so level LAH or LBH operates the corresponding finger magnet FMC1-FMC5. At the end of the train when CD restores the main magnet EMC of the third selective relay unit SRC operates to close the selected bank of contacts in SRC, selection of the levels LCA, LCC and LCE or LCB, LCD and LCF being determined by the condition of relay CH according to whether the digit is odd or even. Connection is then established as in Fig. 1. Calling a two-digit number. The first digit is 8 or 0. This is transferred to SRC as in the manner described above and as the number is even CH operates. The first impulse of the second digit reoperates finger magnet FMA1 over contact 8 or 0 in level LCG. The second digit is therefore registered on SRA or SRB to select the wanted line 81-80 or 01-00. Specification 767,730, [Group XXVI], also is referred to.
GB3051555A 1955-10-25 1955-10-25 Connector and circuit arrangement for automatic telecommunication exchange system Expired GB818491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3051555A GB818491A (en) 1955-10-25 1955-10-25 Connector and circuit arrangement for automatic telecommunication exchange system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3051555A GB818491A (en) 1955-10-25 1955-10-25 Connector and circuit arrangement for automatic telecommunication exchange system

Publications (1)

Publication Number Publication Date
GB818491A true GB818491A (en) 1959-08-19

Family

ID=10308883

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3051555A Expired GB818491A (en) 1955-10-25 1955-10-25 Connector and circuit arrangement for automatic telecommunication exchange system

Country Status (1)

Country Link
GB (1) GB818491A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110078209A (en) * 2019-05-16 2019-08-02 桂林电子科技大学 A kind of method of micro-reduction sulfate formation cadmium sulphur mine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110078209A (en) * 2019-05-16 2019-08-02 桂林电子科技大学 A kind of method of micro-reduction sulfate formation cadmium sulphur mine

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