GB657894A - Improvements in or relating to selective calling systems - Google Patents

Improvements in or relating to selective calling systems

Info

Publication number
GB657894A
GB657894A GB29100/47A GB2910047A GB657894A GB 657894 A GB657894 A GB 657894A GB 29100/47 A GB29100/47 A GB 29100/47A GB 2910047 A GB2910047 A GB 2910047A GB 657894 A GB657894 A GB 657894A
Authority
GB
United Kingdom
Prior art keywords
relay
distributer
oscillator
registered
digit
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
GB29100/47A
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
Publication of GB657894A publication Critical patent/GB657894A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

657,894. Exchange systems. STANDARD TELEPHONES & CABLES, Ltd. Oct. 31, 1947, No. 29100. Convention date, Dec. 13, 1946. [Class 40 (iv)] [Also in Group XXXVIII] Calls may be extended by radio from a toll board to mobile stations. Numbers dialled at the toll board are registered and transmitted as tone signals which are applied as successive modulations to a radio transmission. The dialled digits are registered on switches TH, H, T, U. An oscillator 31 associated with time constant networks 41 and the four register switches mark the networks so that four pulses may be transmitted successively with voice frequencies characteristic of the digits. Slow release relays are marked SR. When key 7 is operated relay 9 follows the impulses and relay 16 repeats them over a distributer RC to switch magnets 17 ... 20. The distributer is stopped when dialling relay 14 falls back during an interdigited pause. When the fourth digit has been registered, relay 22 is operated and the relays 27 to 30 operate and release in sequence to connect the marked networks 41 to the oscillator. Each relay operates only during the period of charge or of discharge of an associated condenser. As relay 30 falls back after the fourth digit, condenser 62 discharges through relay 24 which locks and completes a homing circuit for the distributer RC over the wiper B4 of the fourth bank. The register switches follow the distributer and return home in turn. The oscillator 31 is connected to a radio transmitter 57 through an amplifier 48 and contacts of relay 55. Relay 55 is operated as soon as the distributer moves off normal. To prevent the successive transmission of two pulses of the same frequency, corresponding terminals of the first banks of the register switches are strapped together. If the same digit is dialled successively relay 10 operates an alarm 65 and short circuits 27 to disable the oscillator. Receiving systems with means for detecting a call number transmitted in this manner are described in Specifications 630,815, [Group XL (c)], and 630,819, [Group XXXVIII].
GB29100/47A 1946-12-13 1947-10-31 Improvements in or relating to selective calling systems Expired GB657894A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US657894XA 1946-12-13 1946-12-13
US663859XA 1947-03-20 1947-03-20

Publications (1)

Publication Number Publication Date
GB657894A true GB657894A (en) 1951-09-26

Family

ID=26745991

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29100/47A Expired GB657894A (en) 1946-12-13 1947-10-31 Improvements in or relating to selective calling systems

Country Status (1)

Country Link
GB (1) GB657894A (en)

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