JPS556928A - Extension answer connecting system for key telephone system - Google Patents
Extension answer connecting system for key telephone systemInfo
- Publication number
- JPS556928A JPS556928A JP7928078A JP7928078A JPS556928A JP S556928 A JPS556928 A JP S556928A JP 7928078 A JP7928078 A JP 7928078A JP 7928078 A JP7928078 A JP 7928078A JP S556928 A JPS556928 A JP S556928A
- Authority
- JP
- Japan
- Prior art keywords
- extension
- calling
- wire
- answering
- pln
- 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
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:To decrease the number of the core for the wiring cable by using one piece of extension call wire for both calling and answering use through an automatic switching in the hand-free answering connection system at the extension answering time. CONSTITUTION:The power input of transmission amplifier T-AMP provided within each telephone set is supplied from extension calling wire PL, and the aural output given from amplifier T-AMP is sent back via extension calling wires PL1- PLn. In this connection, extension calling detection relays K1-Kn are provided in accordance with wires PL1-PLn and then connected to hybrid circuit HYB via contacts k1-kn in such way that contact k1 may be installed between wire PL2 and circuit HYB.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7928078A JPS5839436B2 (en) | 1978-06-30 | 1978-06-30 | Extension response connection method in button telephone equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7928078A JPS5839436B2 (en) | 1978-06-30 | 1978-06-30 | Extension response connection method in button telephone equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS556928A true JPS556928A (en) | 1980-01-18 |
JPS5839436B2 JPS5839436B2 (en) | 1983-08-30 |
Family
ID=13685447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7928078A Expired JPS5839436B2 (en) | 1978-06-30 | 1978-06-30 | Extension response connection method in button telephone equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5839436B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61174859A (en) * | 1985-01-30 | 1986-08-06 | Aihon Kk | Interphone telephone hybrid device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5896438U (en) * | 1981-12-21 | 1983-06-30 | 株式会社東芝 | heat exchange ventilation fan |
JPS6425651U (en) * | 1987-08-06 | 1989-02-13 | ||
JP6243682B2 (en) | 2013-09-25 | 2017-12-06 | 住友ゴム工業株式会社 | Medical rubber parts |
-
1978
- 1978-06-30 JP JP7928078A patent/JPS5839436B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61174859A (en) * | 1985-01-30 | 1986-08-06 | Aihon Kk | Interphone telephone hybrid device |
Also Published As
Publication number | Publication date |
---|---|
JPS5839436B2 (en) | 1983-08-30 |
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