JPS4991704A - - Google Patents
Info
- Publication number
- JPS4991704A JPS4991704A JP48004975A JP497573A JPS4991704A JP S4991704 A JPS4991704 A JP S4991704A JP 48004975 A JP48004975 A JP 48004975A JP 497573 A JP497573 A JP 497573A JP S4991704 A JPS4991704 A JP S4991704A
- Authority
- JP
- Japan
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP48004975A JPS4991704A (ja) | 1973-01-09 | 1973-01-09 | |
| US00348278A US3818146A (en) | 1973-01-09 | 1973-04-05 | Signal interrupter circuit for a key telephone system |
| CA186,717A CA997874A (en) | 1973-01-09 | 1973-11-26 | Signal interrupter circuit for a key telephone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP48004975A JPS4991704A (ja) | 1973-01-09 | 1973-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS4991704A true JPS4991704A (ja) | 1974-09-02 |
Family
ID=11598584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP48004975A Pending JPS4991704A (ja) | 1973-01-09 | 1973-01-09 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3818146A (ja) |
| JP (1) | JPS4991704A (ja) |
| CA (1) | CA997874A (ja) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3916117A (en) * | 1974-05-15 | 1975-10-28 | Itt | Key telephone interrupter |
| US3953683A (en) * | 1974-10-29 | 1976-04-27 | San/Bar Corporation | Interrupter for telephone systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3471651A (en) * | 1967-01-13 | 1969-10-07 | Ibm | Telephone ringing circuit |
-
1973
- 1973-01-09 JP JP48004975A patent/JPS4991704A/ja active Pending
- 1973-04-05 US US00348278A patent/US3818146A/en not_active Expired - Lifetime
- 1973-11-26 CA CA186,717A patent/CA997874A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA997874A (en) | 1976-09-28 |
| US3818146A (en) | 1974-06-18 |