JPS5673956A - Callout system for telephone set - Google Patents
Callout system for telephone setInfo
- Publication number
- JPS5673956A JPS5673956A JP15114779A JP15114779A JPS5673956A JP S5673956 A JPS5673956 A JP S5673956A JP 15114779 A JP15114779 A JP 15114779A JP 15114779 A JP15114779 A JP 15114779A JP S5673956 A JPS5673956 A JP S5673956A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- callout
- main device
- telephone set
- control signal
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:To simplify the circuit constitution, by commonly using the signal lines for callout signal and control signal, between a main device and each telephone set. CONSTITUTION:Each of a plurality of telephone sets TL1-TLn connected in parallel with a main device ME, is provided with circuits A1-An which amplify the callout signal from the main device ME, and speakers SP1-SPn to transmit the callout signal and the control signal of the amplifying circuit from the main device ME. In this case, the callout signal and the control signal are transmitted through the use of signal lines L1-Ln.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15114779A JPS5673956A (en) | 1979-11-21 | 1979-11-21 | Callout system for telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15114779A JPS5673956A (en) | 1979-11-21 | 1979-11-21 | Callout system for telephone set |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5673956A true JPS5673956A (en) | 1981-06-19 |
Family
ID=15512392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15114779A Pending JPS5673956A (en) | 1979-11-21 | 1979-11-21 | Callout system for telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5673956A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50124507A (en) * | 1974-03-19 | 1975-09-30 | ||
JPS51101402A (en) * | 1975-03-05 | 1976-09-07 | Iwatsu Electric Co Ltd | |
JPS5234601A (en) * | 1975-09-12 | 1977-03-16 | Iwatsu Electric Co Ltd | Calling circuit |
-
1979
- 1979-11-21 JP JP15114779A patent/JPS5673956A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50124507A (en) * | 1974-03-19 | 1975-09-30 | ||
JPS51101402A (en) * | 1975-03-05 | 1976-09-07 | Iwatsu Electric Co Ltd | |
JPS5234601A (en) * | 1975-09-12 | 1977-03-16 | Iwatsu Electric Co Ltd | Calling circuit |
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