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GB485635A - Improvements in or relating to telephone or like systems - Google Patents

Improvements in or relating to telephone or like systems

Info

Publication number
GB485635A
GB485635A GB10095/38A GB1009538A GB485635A GB 485635 A GB485635 A GB 485635A GB 10095/38 A GB10095/38 A GB 10095/38A GB 1009538 A GB1009538 A GB 1009538A GB 485635 A GB485635 A GB 485635A
Authority
GB
United Kingdom
Prior art keywords
signal
transmission
signals
preliminary
main signal
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
GB10095/38A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB10095/38A priority Critical patent/GB485635A/en
Priority to GB31806/36A priority patent/GB485628A/en
Publication of GB485635A publication Critical patent/GB485635A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Prepayment Telephone Systems (AREA)

Abstract

485,635. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd., WRIGHT, E. P. G., BOWSHER, E. A. H., and BRAY, F. H. Nov. 20, 1936, No. 10095/38. Divided out of 485,628. Drawings to Specification. [Class 40 (iv)] In a system in which alternating-current supervisory signals are sent in both directions over a junction, interference with the transmission of a particular signal, e.g. the answering signal, by the transmission of signals in the other direction, e.g. by the calling subscriber operating his switch-hook or dial, is prevented by sending a preliminary signal (a short pulse) before the main signal (a long pulse). If the preliminary signal gets through it prevents the transmission of any interfering signals for a period sufficient for the reception of the main signal. If the preliminary signal is lost, the transmission of the main signal is delayed until the interfering signals have ceased. The invention is described with reference to a system identical with that described in Specification 485,628. Specification 445,099 also is referred to.
GB10095/38A 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems Expired GB485635A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB10095/38A GB485635A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems
GB31806/36A GB485628A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB10095/38A GB485635A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems
GB31806/36A GB485628A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems

Publications (1)

Publication Number Publication Date
GB485635A true GB485635A (en) 1938-05-20

Family

ID=26247267

Family Applications (2)

Application Number Title Priority Date Filing Date
GB31806/36A Expired GB485628A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems
GB10095/38A Expired GB485635A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB31806/36A Expired GB485628A (en) 1936-11-20 1936-11-20 Improvements in or relating to telephone or like systems

Country Status (1)

Country Link
GB (2) GB485628A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581462A (en) * 1947-04-29 1952-01-08 Int Standard Electric Corp Multipulse voice-frequency code signaling circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581462A (en) * 1947-04-29 1952-01-08 Int Standard Electric Corp Multipulse voice-frequency code signaling circuit

Also Published As

Publication number Publication date
GB485628A (en) 1938-05-20

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