GB945454A - Improvements in or relating to automatic telephone systems - Google Patents

Improvements in or relating to automatic telephone systems

Info

Publication number
GB945454A
GB945454A GB3113762A GB3113762A GB945454A GB 945454 A GB945454 A GB 945454A GB 3113762 A GB3113762 A GB 3113762A GB 3113762 A GB3113762 A GB 3113762A GB 945454 A GB945454 A GB 945454A
Authority
GB
United Kingdom
Prior art keywords
relay
line
energize
terminal
subscriber
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
GB3113762A
Inventor
Leslie James Browell
James Frederick Denby
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 Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and 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 Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB3113762A priority Critical patent/GB945454A/en
Publication of GB945454A publication Critical patent/GB945454A/en
Priority claimed from GB2955965A external-priority patent/GB1139793A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

945,454. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. Aug. 14, 1962, No. 31137/62. Heading H4K. A subscriber having two numbers, e.g. business and residental, may cause incoming calls to be directed from one substation SSN to the other SST by looping the line, operating a locking key KD to connect in a rectifier MRA and then hanging up. This is accomplished by means of a relay set interposed between the line and equipment terminals DIR, EQ of the I.D.F. The looping of the line at SSN causes the line circuit SLCN to return earth on terminal S to energize relays TA, TC. If the subscriber dials, these relays produce no effect, but if he now operates key KD the line relay releases followed by TA and relay OT (which is fed from negative battery) energizes and holds TC. When the subscriber is called, a marking on wire MKR is extended to the line circuit SLCN which applies earth to terminal S to energize relay TS and thus direct the call to the substation SST. Moreover, earth is connected to terminal K to energize the cut-off relay of the line circuit SLCT, which holds relay OT for the duration of the call even though the key UD may be restored. Specifications 890,235 and 909,237 are referred to.
GB3113762A 1962-08-14 1962-08-14 Improvements in or relating to automatic telephone systems Expired GB945454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3113762A GB945454A (en) 1962-08-14 1962-08-14 Improvements in or relating to automatic telephone systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3113762A GB945454A (en) 1962-08-14 1962-08-14 Improvements in or relating to automatic telephone systems
GB2955965A GB1139793A (en) 1965-07-13 1965-07-13 Improvements in or relating to telephone exchange systems

Publications (1)

Publication Number Publication Date
GB945454A true GB945454A (en) 1964-01-02

Family

ID=26259969

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3113762A Expired GB945454A (en) 1962-08-14 1962-08-14 Improvements in or relating to automatic telephone systems

Country Status (1)

Country Link
GB (1) GB945454A (en)

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