AU2394077A - Push-button telephones - Google Patents
Push-button telephonesInfo
- Publication number
- AU2394077A AU2394077A AU23940/77A AU2394077A AU2394077A AU 2394077 A AU2394077 A AU 2394077A AU 23940/77 A AU23940/77 A AU 23940/77A AU 2394077 A AU2394077 A AU 2394077A AU 2394077 A AU2394077 A AU 2394077A
- Authority
- AU
- Australia
- Prior art keywords
- push
- button telephones
- telephones
- button
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762615337 DE2615337A1 (en) | 1976-04-08 | 1976-04-08 | Telephone instrument with dialling keyboard - has dialling pulse relay terminating line loop with resistor ensuring reliable loop state recognition |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2394077A true AU2394077A (en) | 1978-10-12 |
Family
ID=5974856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU23940/77A Expired AU2394077A (en) | 1976-04-08 | 1977-04-04 | Push-button telephones |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2394077A (en) |
DE (1) | DE2615337A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0004901B1 (en) * | 1978-04-14 | 1982-02-17 | Siemens Aktiengesellschaft | Circuit for subscriber stations with selecting means and current supply over the lines in telecommunication systems, especially telephone systems |
IT1246719B (en) * | 1990-11-15 | 1994-11-26 | St Microelectronics Srl | MONOLITHICALLY INTEGRABLE SWITCH WITH REDUCED POWER DISSIPATION, ESPECIALLY FOR TELEPHONE AND SIMILAR EQUIPMENT |
-
1976
- 1976-04-08 DE DE19762615337 patent/DE2615337A1/en not_active Withdrawn
-
1977
- 1977-04-04 AU AU23940/77A patent/AU2394077A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2615337A1 (en) | 1977-10-27 |
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