JPS5775053A - Transmission system for control signal of key telephone set - Google Patents
Transmission system for control signal of key telephone setInfo
- Publication number
- JPS5775053A JPS5775053A JP8960781A JP8960781A JPS5775053A JP S5775053 A JPS5775053 A JP S5775053A JP 8960781 A JP8960781 A JP 8960781A JP 8960781 A JP8960781 A JP 8960781A JP S5775053 A JPS5775053 A JP S5775053A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- control signal
- parallel
- serial
- 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
- H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment
Abstract
PURPOSE:To obtain a key telephone set using the simple time division multiple signal transmission system adapted for transmission of a medium distance, by displaying the synchronizing signal by the absence of a clock signal and by enlarging the amplitude of a control signal more than that of the clock signal. CONSTITUTION:A clock signal (a) and a synchronizing signal (b) are supplied from a generating circuit 18 to a parallel-serial converting circuit 11 and a down signal transmitting circuit 12, and a control signal (c) subjected to time division multiplexing by the converting circuit 11 is transmitted from the down signal transmitting circuit 12. When receiving a down signal (d), a down signal receiving circuit 16 separates it into a clock signal (f), a control signal (e), and a synchronizing signal (h) and supplies them to a serial-parallel converting circuit 17. The clock signal (f) and the synchronizing signal (h) extracted by the down signal receiving circuit 16 are always supplied to a parallel-serial converting circuit 19 for up signal, and an up control signal is subjected to time division multiplexing to become a control signal (i), and this signal (i) is converted to a unipolar control signal (k) by an up signal receiving circuit 24 and is converted to a parallel signal by a serial-parallel converting circuit 25.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8960781A JPS5924597B2 (en) | 1981-06-12 | 1981-06-12 | Control signal transmission method for button telephone equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8960781A JPS5924597B2 (en) | 1981-06-12 | 1981-06-12 | Control signal transmission method for button telephone equipment |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3424177A Division JPS53119604A (en) | 1977-03-28 | 1977-03-28 | Transmission system for control signal of key telephone set |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5775053A true JPS5775053A (en) | 1982-05-11 |
JPS5924597B2 JPS5924597B2 (en) | 1984-06-11 |
Family
ID=13975429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8960781A Expired JPS5924597B2 (en) | 1981-06-12 | 1981-06-12 | Control signal transmission method for button telephone equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5924597B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6119609U (en) * | 1984-07-09 | 1986-02-04 | マツダ株式会社 | engine lubrication system |
-
1981
- 1981-06-12 JP JP8960781A patent/JPS5924597B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5924597B2 (en) | 1984-06-11 |
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