GB327449A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB327449A GB327449A GB37529A GB37529A GB327449A GB 327449 A GB327449 A GB 327449A GB 37529 A GB37529 A GB 37529A GB 37529 A GB37529 A GB 37529A GB 327449 A GB327449 A GB 327449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- test
- wipers
- circuit
- over
- 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)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
327,449. Automatic Telephone Manufacturing Co., Ltd., and Ostline, J. E. Jan. 4, 1929. Automatic exchange systems. - In a selector -with two (or more) sets of wipers arranged to hunt simultaneously, the lines engaged in any position are tested in a definite order of priority, there being an individual test relay GA, GB for each set of wipers and the arrangement being such that the first test relay GA is connected to the first test wiper IP over contacts RM when the rotary magnet R operates, the second test relay GB is connected to the second test-wiper 2P over front contacts if GA of the first line is found busy, whilst the rotary magnet circuit is opened by the second (or last) test relay when both (or all) the lines have been found busy. When an idle line is found, the appropriate switching relay HA, HB energizes in series with the corresponding test relay GA, GB, which does not now energize, and locks up independently thereof to the outgoing test wiper. If the selector reaches the end of its bank without an idle line being found, earth over 11th-step springs CSI energizes relay GA, operates an overflow meter OFM over wiper 1P, and completes a circuit over wipers 1P, 2P (the 11th-step test contact being solid) for relay GB which connects up a busy-hold circuit for the release relay B. The initial circuit of relay G includes off-normal contacts of the switch so that when once released it is unable to re-operate whilst the wipers are returning to normal. Test springs are provided which, if connected, complete a buzzer circuit if the second choice wipers are in use. The test relays GA, GB comprise the two coils of a shunt field relay having a split armature, the two coils being mounted on a common yoke which forms part of the magnetic circuit of each relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37529A GB327449A (en) | 1929-01-04 | 1929-01-04 | Improvements in or relating to telephone systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37529A GB327449A (en) | 1929-01-04 | 1929-01-04 | Improvements in or relating to telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB327449A true GB327449A (en) | 1930-04-04 |
Family
ID=9703297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37529A Expired GB327449A (en) | 1929-01-04 | 1929-01-04 | Improvements in or relating to telephone systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB327449A (en) |
-
1929
- 1929-01-04 GB GB37529A patent/GB327449A/en not_active Expired
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