GB418903A - Improvements in or relating to telephone or like systems - Google Patents

Improvements in or relating to telephone or like systems

Info

Publication number
GB418903A
GB418903A GB12779/33A GB1277933A GB418903A GB 418903 A GB418903 A GB 418903A GB 12779/33 A GB12779/33 A GB 12779/33A GB 1277933 A GB1277933 A GB 1277933A GB 418903 A GB418903 A GB 418903A
Authority
GB
United Kingdom
Prior art keywords
impulses
repeated
pulse
trains
loop
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
GB12779/33A
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 ELECTRIC CO Ltd
Original Assignee
AUTOMATIC 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
Application filed by AUTOMATIC ELECTRIC CO Ltd filed Critical AUTOMATIC ELECTRIC CO Ltd
Priority to GB12779/33A priority Critical patent/GB418903A/en
Priority to US722589A priority patent/US2020953A/en
Publication of GB418903A publication Critical patent/GB418903A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Thin Film Transistor (AREA)

Abstract

418,903. Automatic exchange systems. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, and McCLEW, J. W., 27, Arlescourt Road, West Derby, both in Liverpool. May 2, 1933, No. 12779. [Class 40 (iv).] In an impulse repeater, incoming impulses of one kind are repeated as im. pulses of a different kind the character of which varies in accordance solely with the number of trains of impulses which have been transmitted to the repeater. The term " train includes a single impulse for any purpose. As described, incoming A.C. impulses are repeated as D.C. impulses, trains of A.C. impulses for switch setting being repeated as loop impulses, while subsequent control impulses, e.g. for toll cut-in, breakdown and re-ring, are repeated as leg impulses. The repeater may subsequently revert to loop impulsing conditions. A seizing A.C. pulse operates AC, A, and B pulls up, locks and loops the outgoing side when A falls back at the end of the pulse. Trains of A.C. impulses are repeated over the loop by A, relay C being operated at the commencement of each train to step a counting switch SPM, SPB. After five trains, DC is operated over SPB and locks up so that further control impulses are repeated as leg impulses over the negative wire to operate a differential relay in a subsequent switch for the purposes mentioned above. If the wanted line is idle, current reversal on reply operates D so that E (upper) is energized during the period of slow-operating relay DR and sends back a pulse of A.C. as a supervisory signal to an operator or to operate a calling subscriber's meter. If the called party desires to attract the operator's attention he flicks the switchhook so that relapses of D operate E (lower) to send back A.C. pulses. If the called party releases, an A.C. pulse similarly transmitted is terminated by the relapse of DR. When the calling party or operator releases, a pulse of A.C. operates relays AC, A sufficiently long to shunt down B which opens the outgoing loop and connects up a pair of common relays R, S which interact to home the counting switch. Relays R, S are common to the exchange. As shown, coil RPC has a phantom tap.
GB12779/33A 1933-05-02 1933-05-02 Improvements in or relating to telephone or like systems Expired GB418903A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB12779/33A GB418903A (en) 1933-05-02 1933-05-02 Improvements in or relating to telephone or like systems
US722589A US2020953A (en) 1933-05-02 1934-04-26 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12779/33A GB418903A (en) 1933-05-02 1933-05-02 Improvements in or relating to telephone or like systems

Publications (1)

Publication Number Publication Date
GB418903A true GB418903A (en) 1934-11-02

Family

ID=10010957

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12779/33A Expired GB418903A (en) 1933-05-02 1933-05-02 Improvements in or relating to telephone or like systems

Country Status (2)

Country Link
US (1) US2020953A (en)
GB (1) GB418903A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579469A (en) * 1939-03-24 1951-12-25 Int Standard Electric Corp Revertive calling party line system
US2806093A (en) * 1956-04-23 1957-09-10 Gen Dynamics Corp Telephone test selector
US3114005A (en) * 1959-04-24 1963-12-10 Lenkurt Electric Co Inc Inband signaling system

Also Published As

Publication number Publication date
US2020953A (en) 1935-11-12

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