JPS5214304A - Inter call telephone system in button telephone system - Google Patents
Inter call telephone system in button telephone systemInfo
- Publication number
- JPS5214304A JPS5214304A JP9030875A JP9030875A JPS5214304A JP S5214304 A JPS5214304 A JP S5214304A JP 9030875 A JP9030875 A JP 9030875A JP 9030875 A JP9030875 A JP 9030875A JP S5214304 A JPS5214304 A JP S5214304A
- Authority
- JP
- Japan
- Prior art keywords
- telephone system
- inter call
- button
- inter
- call
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:An inter call telephone system in which indoor wiring consists of talk units and 2 control lines. The wiring number are minimized by sending inter call control data to 2 talk units without influencing the telephone circuit.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9030875A JPS5214304A (en) | 1975-07-25 | 1975-07-25 | Inter call telephone system in button telephone system |
US05/707,324 US4079212A (en) | 1975-07-23 | 1976-07-21 | Extension telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9030875A JPS5214304A (en) | 1975-07-25 | 1975-07-25 | Inter call telephone system in button telephone system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5214304A true JPS5214304A (en) | 1977-02-03 |
JPS5547783B2 JPS5547783B2 (en) | 1980-12-02 |
Family
ID=13994901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9030875A Granted JPS5214304A (en) | 1975-07-23 | 1975-07-25 | Inter call telephone system in button telephone system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5214304A (en) |
-
1975
- 1975-07-25 JP JP9030875A patent/JPS5214304A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5547783B2 (en) | 1980-12-02 |
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