JPS6474891A - Telephone exchange - Google Patents
Telephone exchangeInfo
- Publication number
- JPS6474891A JPS6474891A JP23308587A JP23308587A JPS6474891A JP S6474891 A JPS6474891 A JP S6474891A JP 23308587 A JP23308587 A JP 23308587A JP 23308587 A JP23308587 A JP 23308587A JP S6474891 A JPS6474891 A JP S6474891A
- Authority
- JP
- Japan
- Prior art keywords
- sets
- transmission
- telephone
- single telephone
- telephone exchange
- 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
Landscapes
- Interface Circuits In Exchanges (AREA)
Abstract
PURPOSE:To allow an extension extending distance to be long by providing a single telephone set interface equipment between a telephone set and a main equipment when one or plural numbers of single telephone sets are connected to a main equipment of a telephone exchange. CONSTITUTION:The telephone exchange is composed of the main equipment 1 of the telephone exchange, interface circuits 15 and 16 for the several numbers of the single telephone sets to be respectively connected through two-wire circuit for ping-pong transmission and single telephone sets 11-14 to be connected through an analog two-wire circuit to these circuits at every two sets. Thus, when the extension is extended, transmission between equipments is executed by digital data since the interface equipment is moved together with the single telephone set and accordingly, the transmission loss of a line does not go to be a problem. Since a ping-pong system is adopted as the transmission system of the digital data, two lines are enough as a circuit between the equipments and difficulty to supply a current due to extension extending is not generated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23308587A JPS6474891A (en) | 1987-09-17 | 1987-09-17 | Telephone exchange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23308587A JPS6474891A (en) | 1987-09-17 | 1987-09-17 | Telephone exchange |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474891A true JPS6474891A (en) | 1989-03-20 |
Family
ID=16949560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23308587A Pending JPS6474891A (en) | 1987-09-17 | 1987-09-17 | Telephone exchange |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474891A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10346581B4 (en) * | 2003-01-14 | 2007-12-27 | Renesas Technology Corp. | Method for producing a semiconductor device |
-
1987
- 1987-09-17 JP JP23308587A patent/JPS6474891A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10346581B4 (en) * | 2003-01-14 | 2007-12-27 | Renesas Technology Corp. | Method for producing a semiconductor device |
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