GB343984A - Improvements in or relating to semi-automatic telephone exchange systems - Google Patents
Improvements in or relating to semi-automatic telephone exchange systemsInfo
- 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
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.
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) |
-
1929
- 1929-11-27 GB GB3639829A patent/GB343984A/en not_active Expired
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