JPS644152A - Cpu controlled type subscriber line control interface circuit - Google Patents
Cpu controlled type subscriber line control interface circuitInfo
- Publication number
- JPS644152A JPS644152A JP15890187A JP15890187A JPS644152A JP S644152 A JPS644152 A JP S644152A JP 15890187 A JP15890187 A JP 15890187A JP 15890187 A JP15890187 A JP 15890187A JP S644152 A JPS644152 A JP S644152A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- subscriber line
- section
- conversion section
- cpu
- 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
Abstract
PURPOSE:To easily cope with various subscriber line signal systems by generating a pulse having a width corresponding to a signal from a subscriber line or the like and measuring the pulse width by means of the program control. CONSTITUTION:A subscriber line signal input conversion section 13 converts a DC signal level from a telephone set into a signal level of a CPU section 11 from a telephone set and inputs the result to a CPU 11 via an input line 14. The CPU section 11 uses a program stored in a ROM section 12 to discriminate a sent signal (cut-off or calling or the like) to generate a pulse of a corresponding time width based on the result of discrimination and sent to a carrier device signal output conversion section 16 via an output line 15. The conversion section 16 converts the sent signal to a level suitable for the carrier equipment and gives an output to a common section. Moreover, the signal from a carrier equipment signal input conversion section 17 is processed nearly similarly and outputted to a subscriber line signal output conversion section 20.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15890187A JPS644152A (en) | 1987-06-26 | 1987-06-26 | Cpu controlled type subscriber line control interface circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15890187A JPS644152A (en) | 1987-06-26 | 1987-06-26 | Cpu controlled type subscriber line control interface circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS644152A true JPS644152A (en) | 1989-01-09 |
Family
ID=15681838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15890187A Pending JPS644152A (en) | 1987-06-26 | 1987-06-26 | Cpu controlled type subscriber line control interface circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS644152A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5495187A (en) * | 1994-03-25 | 1996-02-27 | Philips Electronics North America Corporation | CMOS input with Vcc compensated dynamic threshold |
-
1987
- 1987-06-26 JP JP15890187A patent/JPS644152A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5495187A (en) * | 1994-03-25 | 1996-02-27 | Philips Electronics North America Corporation | CMOS input with Vcc compensated dynamic threshold |
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