GB745491A - Improvements in and relating to electric signalling apparatus - Google Patents

Improvements in and relating to electric signalling apparatus

Info

Publication number
GB745491A
GB745491A GB3131853A GB3131853A GB745491A GB 745491 A GB745491 A GB 745491A GB 3131853 A GB3131853 A GB 3131853A GB 3131853 A GB3131853 A GB 3131853A GB 745491 A GB745491 A GB 745491A
Authority
GB
United Kingdom
Prior art keywords
exchange
ringing current
carrier
substation
responds
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
GB3131853A
Inventor
Michael Otto Felix
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research 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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB3131853A priority Critical patent/GB745491A/en
Publication of GB745491A publication Critical patent/GB745491A/en
Priority to MY5900015A priority patent/MY5900015A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

745,491. Manual exchange systems. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. Oct. 11, 1954 [Nov. 11, 1953], No. 31318/53. Class 40 (4). [Also in Group XL (c)] An exchange is linked by radio to a substation and responds to a calling carrier signal only after a delay so as to avoid spurious calls due to radio " noise." To ring the operator, the carrier is interrupted either by momentarily replacing the receiver or by pressing a button on the set. At the end of a call, a clearance signal is given to the operator automatically. At the exchange terminal of the radio link, slow-to-operate relay RS responds to the calling carrier and is followed by A and B. On interruption of the carrier, ringing current from terminals 18, 19 is transmitted to exchange 15 during the delay in release of B. A burst of ringing current is transmitted in the same way when the substation clears. When the exchange calls the substation, line relay A responds to ringing current, rectified at 20, and switches on the transmitter 11 for the duration of the ringing current.
GB3131853A 1953-11-11 1953-11-11 Improvements in and relating to electric signalling apparatus Expired GB745491A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3131853A GB745491A (en) 1953-11-11 1953-11-11 Improvements in and relating to electric signalling apparatus
MY5900015A MY5900015A (en) 1953-11-11 1959-12-30 Improvements in and relating to electric signalling apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3131853A GB745491A (en) 1953-11-11 1953-11-11 Improvements in and relating to electric signalling apparatus

Publications (1)

Publication Number Publication Date
GB745491A true GB745491A (en) 1956-02-29

Family

ID=10321345

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3131853A Expired GB745491A (en) 1953-11-11 1953-11-11 Improvements in and relating to electric signalling apparatus

Country Status (2)

Country Link
GB (1) GB745491A (en)
MY (1) MY5900015A (en)

Also Published As

Publication number Publication date
MY5900015A (en) 1959-12-31

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