GB226782A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB226782A GB226782A GB25664/24A GB2566424A GB226782A GB 226782 A GB226782 A GB 226782A GB 25664/24 A GB25664/24 A GB 25664/24A GB 2566424 A GB2566424 A GB 2566424A GB 226782 A GB226782 A GB 226782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- energizes
- wiper
- relays
- terminal
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
226,782. Western Electric Co., Ltd., (Assignees of Smythe, E. H.). Dec. 24, 1923, [Convention date]. Automatic exchange systems.-The terminals of a connector are divided into groups of unequal size, serving, for example, different Private Branch Exchanges and the wipers are stepped to the wanted group under control of a counting chain built up by the final digit. With this arrangement, all subscribers can be numbered consecutively, and no alteration in numbering is necessary when the size of a P.B.X. group is altered. When the subscriber A reaches the connector shown, relays 3, 4, pull up, and relay 5 repeats the final digit to the counting relays 7, 9, 17 - - 20, &c., which lock up in succession, two for each impulse, and ground terminals in the path of wiper 8 of the connector. Relay 10 pulls up over wiper 8 and energizes the self-interrupting stepping-magnet 12. When wiper 8 leaves the terminal, relay 10 falls back, but re-energizes to cause a further step when the next terminal is encountered. When an ungrounded terminal is reached, relay 10 fails to re-energize, and relay 11 which was energized in parallel with the stepping magnet falls back sluggishly and energizes relays 6, 22. Relay 6 locks up, disconnects the left hand winding of relay 22, and releases the counting relays. Relay 22 connects relay 10 to the test wiper 15 over its own right-hand winding so that the switch hunts for an idle line, the test terminal of which being ungrounded, relay 10 fails to re-energize and the sluggish relapse of relay 22 energizes relay 32 in series with the cut-off relay (e.g. 31). Relay 32 energizes ringing relay 35. The reply of the called party causes relay 33 to remove a short-circuit from switching-relay 34 which locks up and shortcircuits ringing relay 35. Release. Relay 29 which is energized on the relapse of relays 3, 4, energizes the stepping magnet over off-normal springs 16. the change over of which completes the release. Busy tone. If all the lines are busy, wiper 15 moves on to a terminal such as 38 to energize relay 39 which connects up busy transformer 40. Relay 32 is unable to energize in series with relay 39.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US682368A US1567305A (en) | 1923-12-24 | 1923-12-24 | Telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB226782A true GB226782A (en) | 1925-12-03 |
Family
ID=24739387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25664/24A Expired GB226782A (en) | 1923-12-24 | 1924-10-28 | Improvements in or relating to telephone systems |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1567305A (en) |
| FR (1) | FR590656A (en) |
| GB (1) | GB226782A (en) |
-
1923
- 1923-12-24 US US682368A patent/US1567305A/en not_active Expired - Lifetime
-
1924
- 1924-10-28 GB GB25664/24A patent/GB226782A/en not_active Expired
- 1924-12-22 FR FR590656D patent/FR590656A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR590656A (en) | 1925-06-20 |
| US1567305A (en) | 1925-12-29 |
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