GB1184508A - Improvements in or relating to Telephone Exchange Systems. - Google Patents
Improvements in or relating to Telephone Exchange Systems.Info
- Publication number
- GB1184508A GB1184508A GB3031968A GB3031968A GB1184508A GB 1184508 A GB1184508 A GB 1184508A GB 3031968 A GB3031968 A GB 3031968A GB 3031968 A GB3031968 A GB 3031968A GB 1184508 A GB1184508 A GB 1184508A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tone
- main exchange
- digits
- automatic
- common
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
1,184,508. Automatic exchange systems. SIEMENS A.G. 25 June, 1968 [26 June, 1967], No. 30319/68. Heading H4K. In a PBX, main exchange line circuits are interrogated to detect dialling tone from the main exchange before an automatic number sender is started, and to detect equipment engaged tone from the main exchange by examining the line circuits during pauses between digits being sent. An automatic number sender is employed to send the number corresponding to an abbreviated code dialled by the calling extension. When a number sender and a main exchange line circuit have been seized and are ready to send, a common control circuit seizes a common tone detector and connects it to the main exchange line circuit. When dial tone is returned from the main exchange the tone detector starts the automatic number sender and retires. If dial tone does not appear in a given time the tone detector causes the connection of busy tone and then retires. When a main exchange line circuit is occupied with the sending of digits it marks itself available for inspection during intervals between digits and the common control circuit seizes the common tone detector to look for equipment unavailable tone returned from the main exchange. Should such a tone be detected the connection is released and busy tone is sent to the calling extension.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1967S0110507 DE1293867B (en) | 1967-06-26 | 1967-06-26 | Circuit arrangement for a centrally controlled telephone system, in particular telephone branch exchange, with audible signal monitoring of the outgoing connection line |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1184508A true GB1184508A (en) | 1970-03-18 |
Family
ID=7530286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3031968A Expired GB1184508A (en) | 1967-06-26 | 1968-06-25 | Improvements in or relating to Telephone Exchange Systems. |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE717181A (en) |
DE (1) | DE1293867B (en) |
FR (1) | FR1569493A (en) |
GB (1) | GB1184508A (en) |
NL (1) | NL6807815A (en) |
SE (1) | SE386795B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT338880B (en) * | 1972-05-29 | 1977-09-26 | Motronic Elektronische Steueru | NUMBER TRANSMITTING DEVICE FOR REMOTE COMMUNICATION - IN PARTICULAR TELEPHONE SYSTEMS |
-
1967
- 1967-06-26 DE DE1967S0110507 patent/DE1293867B/en not_active Withdrawn
-
1968
- 1968-06-04 NL NL6807815A patent/NL6807815A/xx unknown
- 1968-06-25 FR FR1569493D patent/FR1569493A/fr not_active Expired
- 1968-06-25 GB GB3031968A patent/GB1184508A/en not_active Expired
- 1968-06-26 SE SE869368A patent/SE386795B/en unknown
- 1968-06-26 BE BE717181D patent/BE717181A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
SE386795B (en) | 1976-08-16 |
NL6807815A (en) | 1968-12-27 |
DE1293867B (en) | 1969-04-30 |
BE717181A (en) | 1968-12-27 |
FR1569493A (en) | 1969-05-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |