GB324094A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB324094A GB324094A GB2978828A GB2978828A GB324094A GB 324094 A GB324094 A GB 324094A GB 2978828 A GB2978828 A GB 2978828A GB 2978828 A GB2978828 A GB 2978828A GB 324094 A GB324094 A GB 324094A
- Authority
- GB
- United Kingdom
- Prior art keywords
- operates
- shunts
- earth
- battery
- relay
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Catching Or Destruction (AREA)
Abstract
324,094. Automatic Telephone Manufacturing Co., Ltd., Gillings, C., and Rice, T. G. Oct. 15, 1928. Automatic exchange systems. - In a hunting switch the driving magnet (or interrupter relay controlling the driving magnet) is operated in a local circuit until an idle line is found when the test wiper potential shunts the self-interrupting electromagnet and operates the switching relay. The magnet DM of the line switch (Fig. 1) is driven by self-interruption from earth at 15 in series with resistance R. When a free line is reached battery over the test wiper P shunts DM and operates K (to earth at 15) which disconnects DM and switches through. Relay K is maintained by earth returned over P via both its windings in series to battery at DM. In Fig. 2 the group. selector hunts due to the interaction of G and RM, the circuit of G being via R1 to 116. When a free circuit is found, battery on P (such as that shown at R2) shunts G and operates switching relay H. If all circuits are busy, CS operates on the eleventh step to return busy tone from BF.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2978828A GB324094A (en) | 1928-10-15 | 1928-10-15 | Improvements in or relating to telephone systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2978828A GB324094A (en) | 1928-10-15 | 1928-10-15 | Improvements in or relating to telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB324094A true GB324094A (en) | 1930-01-15 |
Family
ID=10297166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2978828A Expired GB324094A (en) | 1928-10-15 | 1928-10-15 | Improvements in or relating to telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB324094A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE960472C (en) * | 1953-05-01 | 1957-03-21 | Automatic Elect Lab | Checking dialer for automatic telephone systems |
-
1928
- 1928-10-15 GB GB2978828A patent/GB324094A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE960472C (en) * | 1953-05-01 | 1957-03-21 | Automatic Elect Lab | Checking dialer for automatic telephone systems |
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