GB562286A - Electrical signalling systems - Google Patents

Electrical signalling systems

Info

Publication number
GB562286A
GB562286A GB111743A GB111743A GB562286A GB 562286 A GB562286 A GB 562286A GB 111743 A GB111743 A GB 111743A GB 111743 A GB111743 A GB 111743A GB 562286 A GB562286 A GB 562286A
Authority
GB
United Kingdom
Prior art keywords
relay
terminates
filter
junction
relays
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
GB111743A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to GB111743A priority Critical patent/GB562286A/en
Publication of GB562286A publication Critical patent/GB562286A/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)

Abstract

562,286. Exchange systems. STANDARD TELEPHONES & CABLES, Ltd. (International Standard Electric Corporation). Jan. 22, 1943, No. 1117. [Class 40 (iv)] A two-way junction over which calling and supervisory signals are sent by means of sub-audio frequency currents terminates in a circuit which includes a line filter 1 for stopping the sub-audio frequencies, relays 6, 10 for responding to the signals from the junction and from an operator's position and a common polarized relay 7 for disabling either of the relays 6, 10 when the other is operative. As shown, 50 cycle current from the line passes through a tuned circuit 4 and rectifier bridge 5 to relay 6 in series with one winding of relay 7. Relay 6 controls a supervisory relay while relay 7 connects up relay 12 which disables relay 10 and terminates the filter 1 in a resistance 17. Similarly, 25 cycle current from the operator's position passes through a tuned circuit 8 and rectifier bridge 9 to relay 10 in series with the other winding of relay 7. Relay 10 repeats the signal over the junction at 50 cycles in a manner not shown, while relay 7 connects up relay 11 which disables relay 6 and terminates the filter 1 in a resistance 16.
GB111743A 1943-01-22 1943-01-22 Electrical signalling systems Expired GB562286A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB111743A GB562286A (en) 1943-01-22 1943-01-22 Electrical signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB111743A GB562286A (en) 1943-01-22 1943-01-22 Electrical signalling systems

Publications (1)

Publication Number Publication Date
GB562286A true GB562286A (en) 1944-06-26

Family

ID=9716456

Family Applications (1)

Application Number Title Priority Date Filing Date
GB111743A Expired GB562286A (en) 1943-01-22 1943-01-22 Electrical signalling systems

Country Status (1)

Country Link
GB (1) GB562286A (en)

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