JPS5333505A - Multi-frequency signal output monitor system for key telephone set - Google Patents
Multi-frequency signal output monitor system for key telephone setInfo
- Publication number
- JPS5333505A JPS5333505A JP10777476A JP10777476A JPS5333505A JP S5333505 A JPS5333505 A JP S5333505A JP 10777476 A JP10777476 A JP 10777476A JP 10777476 A JP10777476 A JP 10777476A JP S5333505 A JPS5333505 A JP S5333505A
- Authority
- JP
- Japan
- Prior art keywords
- frequency signal
- key telephone
- signal output
- telephone set
- monitor system
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To prevent the malfunction for a key telephone receiver by outputting a multi-frequency signal for a prescribed time or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10777476A JPS5333505A (en) | 1976-09-10 | 1976-09-10 | Multi-frequency signal output monitor system for key telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10777476A JPS5333505A (en) | 1976-09-10 | 1976-09-10 | Multi-frequency signal output monitor system for key telephone set |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5333505A true JPS5333505A (en) | 1978-03-29 |
Family
ID=14467663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10777476A Pending JPS5333505A (en) | 1976-09-10 | 1976-09-10 | Multi-frequency signal output monitor system for key telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5333505A (en) |
-
1976
- 1976-09-10 JP JP10777476A patent/JPS5333505A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5333505A (en) | Multi-frequency signal output monitor system for key telephone set | |
JPS5373909A (en) | Time division multiplex signal transmission system | |
JPS54670A (en) | Alarm wrista watch | |
JPS5365692A (en) | Guarding system | |
JPS5379305A (en) | Remote control signal receiving system in automatic receiving unit | |
JPS5338912A (en) | Sending/stop system for signal sound | |
JPS5434644A (en) | Input/output circiut | |
JPS51138107A (en) | Signal detection output system | |
JPS52130225A (en) | Signal transmission unit | |
JPS52132708A (en) | Line monitor system | |
JPS535910A (en) | Signal detecting circuit | |
JPS52123118A (en) | Digital communication unit completed into duplicated reducdant circuit | |
JPS5393712A (en) | Malfunction preventing circuit for signal receiver | |
JPS52126109A (en) | Line signal watch circuit | |
JPS52106603A (en) | Oscillation circuit for remote control | |
JPS5336405A (en) | Loop transmission system | |
JPS52106602A (en) | Signal receiving unit | |
JPS53119604A (en) | Transmission system for control signal of key telephone set | |
JPS5365609A (en) | Time-division channel system | |
JPS5432908A (en) | Main wire centralized ringing device for telephone | |
JPS5328315A (en) | Multi-frequency signal receiver | |
JPS538501A (en) | Inter-call device for individual selection | |
JPS53142106A (en) | Voice answering system | |
JPS5366310A (en) | Tone signal detecting circuit | |
JPS51113509A (en) | Signal transmitting time control system |