GB329028A - Improvements in or relating to automatic and semi-automatic telephone systems - Google Patents
Improvements in or relating to automatic and semi-automatic telephone systemsInfo
- Publication number
- GB329028A GB329028A GB468929A GB468929A GB329028A GB 329028 A GB329028 A GB 329028A GB 468929 A GB468929 A GB 468929A GB 468929 A GB468929 A GB 468929A GB 329028 A GB329028 A GB 329028A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- energizes
- test
- series
- switches
- 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
Abstract
329,028. Standard Telephones & Cables, Ltd., and Wright, E. P G. Feb. 1929. Automatic and semi-automatic exchange systems.-Trunk-offering distributors and connectors are controlled by apparatus connected in multiple to a group of similar switches and including a pair of marking switches on which the incoming digits are recorded. The distributors, connectors and marking switches are all of the single-motion type. Test distributor, Fig. 1. Upon seizure, relay IK energizes in series with relay 12, which cuts out its lower winding to mark the common apparatus and hence all the distributors engaged, while relay IK associates the common apparatus with the seized distributor. Line and release relays 11, 14 energize, and the first train of impulses are repeated to magnet ITC. Series relay 13 is operated during the train, and two-step relay 15 energizes fully at the end, transferring the impulse circuit to magnet IUC. Magnet S operates when relay 13 pulls up and advances the distributor until the position marked by the switch ITC is reached, when relay 16 energizes over wipers C, ITC1. Belay 15 connects up relay 19, which locks. Two-step relay 17 energizes fully at the end of the second train of impulses, and re-closes the circuit of magnet S, which operates until the position marked by the switch IUC is reached, when relay 18 energizes over wipers C, IUC1. Test relay IH is now connected to test wiper T in series with relay 19, and energizes provided the test connector is idle, locks, switches through and disconnects relay IK to release the common apparatus. Homing circuits are completed for the switches ITC, IUC when relay 14 falls back. If the test connector is engaged, relay 19 relapses and busy tone is connected up from wire BT. Test connector, Fig. 2. Upon seizure, relay 2K energizes in series with relay 22, and individual line and release relays 2A, 2B pull up. The successive trains of impulses are repeated to magnets 2TC, 2UC in series with relay 23, two-step relays 25, 27 being energized at the ends of the trains. Magnet 2S advances the connector successively to the positions marked by the switches 2TC, 2UC, and relays 26, 28 determine when these positions are reached. No test of the wanted line is made, and switching relay 2H energizes locally in series with relay 29, locks and disconnects relay 2K to release the common apparatus. The group-marking terminals in the connector are used for the first lines of the groups; thus if the test digit is 1, the marking- wipers 2UC1, 2TC1 are connected together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB468929A GB329028A (en) | 1929-02-12 | 1929-02-12 | Improvements in or relating to automatic and semi-automatic telephone systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB468929A GB329028A (en) | 1929-02-12 | 1929-02-12 | Improvements in or relating to automatic and semi-automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB329028A true GB329028A (en) | 1930-05-12 |
Family
ID=9781935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB468929A Expired GB329028A (en) | 1929-02-12 | 1929-02-12 | Improvements in or relating to automatic and semi-automatic telephone systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB329028A (en) |
-
1929
- 1929-02-12 GB GB468929A patent/GB329028A/en not_active Expired
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