FR2280141B1 - - Google Patents
Info
- Publication number
- FR2280141B1 FR2280141B1 FR7426100A FR7426100A FR2280141B1 FR 2280141 B1 FR2280141 B1 FR 2280141B1 FR 7426100 A FR7426100 A FR 7426100A FR 7426100 A FR7426100 A FR 7426100A FR 2280141 B1 FR2280141 B1 FR 2280141B1
- Authority
- FR
- France
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
-
- 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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7426100A FR2280141A1 (fr) | 1974-07-26 | 1974-07-26 | Systeme de signalisation entre centres de traitement d'informations |
ES439668A ES439668A1 (es) | 1974-07-26 | 1975-07-23 | Un sistema de senalizacion entre centros de proceso de da- tos. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7426100A FR2280141A1 (fr) | 1974-07-26 | 1974-07-26 | Systeme de signalisation entre centres de traitement d'informations |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2280141A1 FR2280141A1 (fr) | 1976-02-20 |
FR2280141B1 true FR2280141B1 (sv) | 1978-03-31 |
Family
ID=9141787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7426100A Granted FR2280141A1 (fr) | 1974-07-26 | 1974-07-26 | Systeme de signalisation entre centres de traitement d'informations |
Country Status (2)
Country | Link |
---|---|
ES (1) | ES439668A1 (sv) |
FR (1) | FR2280141A1 (sv) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1053821A (en) * | 1976-08-19 | 1979-05-01 | Ernst A. Munter | Receiver/sender for signalling between telephone switching facilities |
FR2453575A1 (fr) * | 1979-04-06 | 1980-10-31 | Cit Alcatel | Equipement de signalisation multifrequence a commande centralisee |
EP0277471B1 (fr) * | 1987-02-05 | 1991-09-18 | Alcatel Bell-Sdt S.A. | Procédé de détection et de correction d'erreurs de transmission |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3604947A (en) * | 1965-10-23 | 1971-09-14 | Aerojet General Co | Variable filter device |
CH472149A (de) * | 1967-03-22 | 1969-04-30 | Siemens Ag | N-Pfad-Bandfilter |
DE1591473B1 (de) * | 1967-04-11 | 1971-12-09 | Siemens Ag | Empfaenger fuer mehrere wellenbereiche |
GB1378818A (en) * | 1971-08-27 | 1974-12-27 | Rockwell International Corp | Digital tone signal generator |
FR2191827A5 (sv) * | 1972-06-27 | 1974-02-01 | Socotel Mixte D Veloppem |
-
1974
- 1974-07-26 FR FR7426100A patent/FR2280141A1/fr active Granted
-
1975
- 1975-07-23 ES ES439668A patent/ES439668A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES439668A1 (es) | 1977-03-16 |
FR2280141A1 (fr) | 1976-02-20 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |