FR2280141A1 - System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filters - Google Patents
System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filtersInfo
- Publication number
- FR2280141A1 FR2280141A1 FR7426100A FR7426100A FR2280141A1 FR 2280141 A1 FR2280141 A1 FR 2280141A1 FR 7426100 A FR7426100 A FR 7426100A FR 7426100 A FR7426100 A FR 7426100A FR 2280141 A1 FR2280141 A1 FR 2280141A1
- Authority
- FR
- France
- Prior art keywords
- signal
- frequency
- decoders
- frequencies
- predetermined
- 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
- 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)
Abstract
Two equipments respectively associated with two data centres exchange under orders from the centres code and control signals. The code signal is formed by the addition of two approximately sinusoidal elementary signals whose fundamental frequencies are different and which are chosen from six predetermined frequencies f1-f6. The control signal is similar to an elementary signal, and has a predetermined fundamental frequency f7. Each equipment consists of a first arrangement of circuits having seven sub assembly frequency dividers (in a ratio N) and decoders fed by a signal of frequency F supplied by a quartz oscillator. These subassemblies deliver respectively a binary signal constituted by switching pulses representing, at frequency F divided by n.N. equal to one of the predetermined, frequencies f1-f7, the sequence of n first binary numbers. Seven filter sub assemblies identify the frequency of each elementary signal.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7426100A FR2280141A1 (en) | 1974-07-26 | 1974-07-26 | System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filters |
ES439668A ES439668A1 (en) | 1974-07-26 | 1975-07-23 | A signaling system between data process centers. (Machine-translation by Google Translate, not legally binding) |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7426100A FR2280141A1 (en) | 1974-07-26 | 1974-07-26 | System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filters |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2280141A1 true FR2280141A1 (en) | 1976-02-20 |
FR2280141B1 FR2280141B1 (en) | 1978-03-31 |
Family
ID=9141787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7426100A Granted FR2280141A1 (en) | 1974-07-26 | 1974-07-26 | System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filters |
Country Status (2)
Country | Link |
---|---|
ES (1) | ES439668A1 (en) |
FR (1) | FR2280141A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2362545A1 (en) * | 1976-08-19 | 1978-03-17 | Northern Telecom Ltd | UNIVERSAL RECEIVER-TRANSMITTER OF TELEPHONE SIGNALING SIGNALS |
FR2453575A1 (en) * | 1979-04-06 | 1980-10-31 | Cit Alcatel | Multifrequency selection unit for telecommunication centre - has transmitter and receiver units connected to interface lines through switch circuits controlled by microprocessor |
EP0277471A1 (en) * | 1987-02-05 | 1988-08-10 | Alcatel Bell-Sdt S.A. | Method for the detection and correction of transmission errors |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3526858A (en) * | 1967-03-22 | 1970-09-01 | Siemens Ag | Band filter of the n-path type |
US3551857A (en) * | 1967-04-11 | 1970-12-29 | Siemens Ag | Am-fm n-path filter arrangement with center frequency and band width adjustments |
US3604947A (en) * | 1965-10-23 | 1971-09-14 | Aerojet General Co | Variable filter device |
FR2151815A5 (en) * | 1971-08-27 | 1973-04-20 | North American Rockwell | |
FR2191827A5 (en) * | 1972-06-27 | 1974-02-01 | Socotel Mixte D Veloppem |
-
1974
- 1974-07-26 FR FR7426100A patent/FR2280141A1/en active Granted
-
1975
- 1975-07-23 ES ES439668A patent/ES439668A1/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3604947A (en) * | 1965-10-23 | 1971-09-14 | Aerojet General Co | Variable filter device |
US3526858A (en) * | 1967-03-22 | 1970-09-01 | Siemens Ag | Band filter of the n-path type |
US3551857A (en) * | 1967-04-11 | 1970-12-29 | Siemens Ag | Am-fm n-path filter arrangement with center frequency and band width adjustments |
FR2151815A5 (en) * | 1971-08-27 | 1973-04-20 | North American Rockwell | |
FR2191827A5 (en) * | 1972-06-27 | 1974-02-01 | Socotel Mixte D Veloppem |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2362545A1 (en) * | 1976-08-19 | 1978-03-17 | Northern Telecom Ltd | UNIVERSAL RECEIVER-TRANSMITTER OF TELEPHONE SIGNALING SIGNALS |
FR2453575A1 (en) * | 1979-04-06 | 1980-10-31 | Cit Alcatel | Multifrequency selection unit for telecommunication centre - has transmitter and receiver units connected to interface lines through switch circuits controlled by microprocessor |
EP0277471A1 (en) * | 1987-02-05 | 1988-08-10 | Alcatel Bell-Sdt S.A. | Method for the detection and correction of transmission errors |
Also Published As
Publication number | Publication date |
---|---|
FR2280141B1 (en) | 1978-03-31 |
ES439668A1 (en) | 1977-03-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |