GB398812A - Improvements in or relating to telephone systems or the like - Google Patents

Improvements in or relating to telephone systems or the like

Info

Publication number
GB398812A
GB398812A GB825932A GB825932A GB398812A GB 398812 A GB398812 A GB 398812A GB 825932 A GB825932 A GB 825932A GB 825932 A GB825932 A GB 825932A GB 398812 A GB398812 A GB 398812A
Authority
GB
United Kingdom
Prior art keywords
impulses
weak
receiving end
rectifiers
relays
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
GB825932A
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 ELECTRIC CO Ltd
Original Assignee
AUTOMATIC 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 ELECTRIC CO Ltd filed Critical AUTOMATIC ELECTRIC CO Ltd
Priority to GB825932A priority Critical patent/GB398812A/en
Publication of GB398812A publication Critical patent/GB398812A/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
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator

Abstract

398,812. Automatic exchange systems. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, McCLEW, J. W., 27, Arlescourt Road. West Derby, both in Liverpool, and BAKER, G. T., Blackbrook, Caerphilly, Glamorgan. March 19, 1932, No. 8259. [Class 40 (iv).] Selective signalling, e.g. between a keyboard and registers in a system such as that described in Specification 393,583, is effected by transmitting combinations of + and - impulses over two or more line wires, the impulses being separated at the receiving end by rectifiers. As shown, a keyboard transmits strong or weak - impulses or weak + impulses over wires A, B, each of which is branched at the receiving end through metal rectifiers MRA .. MRD. The relays X, Z are sensitive to + impulses and marginal to - impulses. Slave relays WA .. ZA control lamps 1 .. 0, STA, STB, C. The signal sent by S is variable by connecting terminal c to either of the terminals a, b. The number of selections may be increased by arranging that a single operation of a key produces two or more impulses in the same wire.
GB825932A 1932-03-19 1932-03-19 Improvements in or relating to telephone systems or the like Expired GB398812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB825932A GB398812A (en) 1932-03-19 1932-03-19 Improvements in or relating to telephone systems or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB825932A GB398812A (en) 1932-03-19 1932-03-19 Improvements in or relating to telephone systems or the like

Publications (1)

Publication Number Publication Date
GB398812A true GB398812A (en) 1933-09-19

Family

ID=9849067

Family Applications (1)

Application Number Title Priority Date Filing Date
GB825932A Expired GB398812A (en) 1932-03-19 1932-03-19 Improvements in or relating to telephone systems or the like

Country Status (1)

Country Link
GB (1) GB398812A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003812B (en) * 1954-07-03 1957-03-07 Siemens Ag Key counter with capacitor storage for telecommunications, especially telephone systems
DE1005133B (en) * 1955-12-30 1957-03-28 Siemens Ag Circuit arrangement for the transmission of numbers in direct current dual code over two-wire lines in telecommunication systems, in particular telephone systems
DE1037526B (en) * 1957-05-17 1958-08-28 Siemens Ag Circuit arrangement for evaluating? different potentials, especially for digit identification, in the transmission of information in message switching systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003812B (en) * 1954-07-03 1957-03-07 Siemens Ag Key counter with capacitor storage for telecommunications, especially telephone systems
DE1005133B (en) * 1955-12-30 1957-03-28 Siemens Ag Circuit arrangement for the transmission of numbers in direct current dual code over two-wire lines in telecommunication systems, in particular telephone systems
DE1037526B (en) * 1957-05-17 1958-08-28 Siemens Ag Circuit arrangement for evaluating? different potentials, especially for digit identification, in the transmission of information in message switching systems

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