GB263080A - Improvements in automatic telephone systems - Google Patents
Improvements in automatic telephone systemsInfo
- Publication number
- GB263080A GB263080A GB12730/26A GB1273026A GB263080A GB 263080 A GB263080 A GB 263080A GB 12730/26 A GB12730/26 A GB 12730/26A GB 1273026 A GB1273026 A GB 1273026A GB 263080 A GB263080 A GB 263080A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- test multiple
- metering
- line
- produces
- 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)
- Interface Circuits In Exchanges (AREA)
Abstract
263,080. Deutsche Telephonwerke und Kabelindustrie Akt.-Ces. Dec. 17, 1925, [Convention date]. Automatic and senzi-automatic exchange systems. -In a system employing line switches of the kind described in Specification 263,079, in which the line relay LR remains operated during conversation and guard potential is supplied to the test multiple over a front contact of the switching relay P, metering is effected, upon the reply of the called party, by means of relays SR, ZR in the group selector which connect battery to the test multiple to energize a differential metering relay H in the line switch. The opposed windings of this relay are of the same resistance, but one has more turns than the other, so that, while a weak current produces a differential effect, a strong current, which might be connected momentarily to the test multiple over the magnet D<1> of another line switch, causes saturation of the core and produces no effect.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE263079X | 1925-12-17 | ||
DE263080X | 1925-12-17 | ||
DED49458D DE464095C (en) | 1925-12-17 | 1925-12-18 | Circuit arrangement for preselector |
Publications (1)
Publication Number | Publication Date |
---|---|
GB263080A true GB263080A (en) | 1927-02-24 |
Family
ID=27186903
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12729/26A Expired GB263079A (en) | 1925-12-17 | 1926-05-18 | Improvements in automatic telephone systems |
GB12730/26A Expired GB263080A (en) | 1925-12-17 | 1926-05-18 | Improvements in automatic telephone systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12729/26A Expired GB263079A (en) | 1925-12-17 | 1926-05-18 | Improvements in automatic telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB263079A (en) |
-
1926
- 1926-05-18 GB GB12729/26A patent/GB263079A/en not_active Expired
- 1926-05-18 GB GB12730/26A patent/GB263080A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB263079A (en) | 1927-02-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB263080A (en) | Improvements in automatic telephone systems | |
GB431925A (en) | Improvements in or relating to electrical signalling systems | |
DE245733C (en) | ||
GB522457A (en) | Improvements in or relating to systems of simultaneous telephony on a number of lines | |
GB482998A (en) | Improvements in or relating to electric signalling systems, for instance telephone systems | |
GB222847A (en) | Improvements in impulse repeaters, particularly for telephone systems | |
DE376406C (en) | Method and circuit for wireless telephony with two-way communication | |
DE897112C (en) | Circuit arrangement for teleprinting systems, which allows the switching on of query or monitoring machines | |
GB207219A (en) | Automatic telephone system and switching apparatus therefor | |
GB496926A (en) | Circuit arrangements for telegraph systems | |
GB207483A (en) | Automatic telephone system and switching apparatus therefor | |
DE638537C (en) | Hybrid circuit for telephone systems with four-wire and two-wire circuits | |
AT137218B (en) | Circuit arrangement for telephone systems. | |
GB296424A (en) | Circuit arrangement for double duty selectors in telephone installations | |
AT91218B (en) | Circuit arrangement for telephone systems with preselectors assigned to the subscriber lines and with separate setting and speech paths. | |
DE536090C (en) | Telephone system for company lines with maintenance of conversation secrecy | |
AT126369B (en) | Circuit arrangement for automatic telephone systems, in particular private branch exchanges. | |
AT91196B (en) | Circuit arrangement for telephone systems with extensions connected in series. | |
GB490137A (en) | Circuit arrangement for the metering of different grades of connection in automatic telephone systems | |
AT65132B (en) | Circuit for a telephone line dialer. | |
GB183116A (en) | Improvements in or relating to telephone systems | |
DE335821C (en) | Circuit arrangement for calling high-frequency multiple telephone connections | |
GB230763A (en) | Improvements in or relating to telephone exchange systems | |
GB183431A (en) | Improvements in or relating to telephone systems | |
GB191021120A (en) | Circuits for Telephone Exchanges. |