CH236666A - Telecommunications exchange system. - Google Patents
Telecommunications exchange system.Info
- Publication number
- CH236666A CH236666A CH236666DA CH236666A CH 236666 A CH236666 A CH 236666A CH 236666D A CH236666D A CH 236666DA CH 236666 A CH236666 A CH 236666A
- Authority
- CH
- Switzerland
- Prior art keywords
- exchange system
- telecommunications exchange
- telecommunications
- exchange
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Alarm Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE236666X | 1936-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH236666A true CH236666A (en) | 1945-02-28 |
Family
ID=3866331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH236666D CH236666A (en) | 1936-05-27 | 1937-02-19 | Telecommunications exchange system. |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH236666A (en) |
DE (1) | DE760243C (en) |
FR (1) | FR822124A (en) |
GB (1) | GB490015A (en) |
NL (1) | NL46909C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1026374B (en) * | 1955-08-30 | 1958-03-20 | Siemens Ag | Device for simultaneous monitoring for short circuit or earth fault and for wire breakage of a line pair that is used for the transmission of messages, in particular fire messages, and is used for quiescent current monitored line pairs |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1013706B (en) * | 1956-01-14 | 1957-08-14 | Telefonbau & Normalzeit Gmbh | Circuit arrangement for the transmission of messages over discussed telephone connection lines |
DE1086758B (en) * | 1957-12-23 | 1960-08-11 | Wilhelm Vershoven | Fault reporting device whose monitoring alarms can be connected in parallel to telephone subscriber lines via modulators |
CN102944730B (en) * | 2012-11-05 | 2015-06-10 | 深圳创维-Rgb电子有限公司 | Automatic detection device for voltage abnormal state |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE570938C (en) * | 1927-12-29 | 1933-02-21 | Siemens & Halske Akt Ges | Circuit arrangement for telephone systems with intercom stations which are provided with self-loading devices |
DE636313C (en) * | 1927-12-30 | 1936-10-10 | Siemens & Halske Akt Ges | Circuit arrangement for telephone systems for the transmission of surveillance signals to an officer |
CH174234A (en) * | 1932-12-23 | 1934-12-31 | Siemens Ag | Circuit arrangement for transmitting messages, in particular fire and police messages, to a message receiving center. |
CH181393A (en) * | 1934-06-23 | 1935-12-15 | Autophon Ag | Circuit arrangement for telecommunications systems. |
-
0
- NL NL46909D patent/NL46909C/xx active
-
1937
- 1937-02-05 GB GB3482/37A patent/GB490015A/en not_active Expired
- 1937-02-19 CH CH236666D patent/CH236666A/en unknown
- 1937-02-25 DE DEI57222D patent/DE760243C/en not_active Expired
- 1937-03-20 FR FR822124D patent/FR822124A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1026374B (en) * | 1955-08-30 | 1958-03-20 | Siemens Ag | Device for simultaneous monitoring for short circuit or earth fault and for wire breakage of a line pair that is used for the transmission of messages, in particular fire messages, and is used for quiescent current monitored line pairs |
Also Published As
Publication number | Publication date |
---|---|
GB490015A (en) | 1938-08-05 |
DE760243C (en) | 1953-06-15 |
NL46909C (en) | |
FR822124A (en) | 1937-12-21 |
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