GB343984A - Improvements in or relating to semi-automatic telephone exchange systems - Google Patents

Improvements in or relating to semi-automatic telephone exchange systems

Info

Publication number
GB343984A
GB343984A GB3639829A GB3639829A GB343984A GB 343984 A GB343984 A GB 343984A GB 3639829 A GB3639829 A GB 3639829A GB 3639829 A GB3639829 A GB 3639829A GB 343984 A GB343984 A GB 343984A
Authority
GB
United Kingdom
Prior art keywords
wire
order
busy
exchange
wanted
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
GB3639829A
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 GB3639829A priority Critical patent/GB343984A/en
Publication of GB343984A publication Critical patent/GB343984A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)

Abstract

343,984. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd., WRIGHT, E. P. G., and HAIGH, L. B., Columbia House, Aldwych, London. Nov. 27, 1929, No. 36398. Drawings to Specification. [Class 40 (iv).] In a call from an automatic to a manual exchange the number of the wanted subscriber and, if desired, the name of the calling or wanted exchange, is transmitted over an order-wire by means of a callannouncer mechanism. The number is recorded at the automatic exchange on a register associated with an outgoing repeater and such registers having stored numbers are associated in turn with the order-wire by means of a distributing switch. If the wanted line is busy, the operation of a busy key sends back a signal over the order-wire which causes the register and order-wire to be released and a busy-tone to be transmitted to the calling subscriber. The invention is described with reference to a system identical with that described in Specification 343,138.
GB3639829A 1929-11-27 1929-11-27 Improvements in or relating to semi-automatic telephone exchange systems Expired GB343984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3639829A GB343984A (en) 1929-11-27 1929-11-27 Improvements in or relating to semi-automatic telephone exchange systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3639829A GB343984A (en) 1929-11-27 1929-11-27 Improvements in or relating to semi-automatic telephone exchange systems

Publications (1)

Publication Number Publication Date
GB343984A true GB343984A (en) 1931-02-27

Family

ID=10387768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3639829A Expired GB343984A (en) 1929-11-27 1929-11-27 Improvements in or relating to semi-automatic telephone exchange systems

Country Status (1)

Country Link
GB (1) GB343984A (en)

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