BE788177Q - Procede et dispositif d'essai en circuit ferme d'un modulateur-demodulateur - Google Patents
Procede et dispositif d'essai en circuit ferme d'un modulateur-demodulateurInfo
- Publication number
- BE788177Q BE788177Q BE788177A BE788177A BE788177Q BE 788177 Q BE788177 Q BE 788177Q BE 788177 A BE788177 A BE 788177A BE 788177 A BE788177 A BE 788177A BE 788177 Q BE788177 Q BE 788177Q
- Authority
- BE
- Belgium
- Prior art keywords
- demodulator
- modulator
- test method
- closed circuit
- circuit test
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
- H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
- H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3545470A | 1970-05-07 | 1970-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE788177Q true BE788177Q (fr) | 1972-12-18 |
Family
ID=21882775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE788177A BE788177Q (fr) | 1970-05-07 | 1972-08-30 | Procede et dispositif d'essai en circuit ferme d'un modulateur-demodulateur |
Country Status (4)
Country | Link |
---|---|
US (1) | US3655915A (fr) |
BE (1) | BE788177Q (fr) |
CA (1) | CA952197A (fr) |
GB (1) | GB1389939A (fr) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3398234A (en) * | 1964-08-04 | 1968-08-20 | American Telephone & Telegraph | Multiple address circuit |
DE2102511C3 (de) * | 1971-01-20 | 1974-01-03 | Vierling, Oskar, Prof. Dr.Phil. Habil., 8553 Ebermannstadt | Verfahren zum Messen der frequenzabhängigen Dämpfung einer Zweidrahtleitung |
US3767856A (en) * | 1971-07-20 | 1973-10-23 | Burroughs Corp | Data set tester |
US3739338A (en) * | 1971-07-23 | 1973-06-12 | Xerox Corp | Data coupling apparatus |
US3743938A (en) * | 1971-08-10 | 1973-07-03 | Gen Datacomm Ind Inc | Closed data loop test apparatus for data transmission modem |
US3715496A (en) * | 1971-10-21 | 1973-02-06 | Ibm | Digital band-pass filter for a single circuit full duplex transmission system |
BE788949A (fr) * | 1971-11-01 | 1973-03-19 | Gen Datacomm Ind Inc | Procede d'essai de modulateur-demodulateur |
US3869580A (en) * | 1971-11-15 | 1975-03-04 | Milgo Electronic Corp | Apparatus for testing data modems which simultaneously transmit and receive frequency multiplexed signals |
US3952163A (en) * | 1972-04-24 | 1976-04-20 | General Datacomm Industries, Inc. | Method and apparatus for testing in FDM system |
US4039751A (en) * | 1972-04-24 | 1977-08-02 | General Datacomm Industries, Inc. | Method and apparatus for closed loop testing of first and second modulators and demodulators |
US3869577A (en) * | 1972-04-24 | 1975-03-04 | Gen Datacomm Ind Inc | Method and apparatus for control signaling in fdm system |
US3819878A (en) * | 1972-12-18 | 1974-06-25 | Antekna Inc | Transmission test set for telephone circuit data communication systems |
FR2230131B1 (fr) * | 1973-05-14 | 1977-02-11 | Honeywell Bull Soc Ind | |
US3846582A (en) * | 1973-08-06 | 1974-11-05 | Bell Telephone Labor Inc | Data transmission terminal for fsk frequency duplexed systems |
US3956589A (en) * | 1973-11-26 | 1976-05-11 | Paradyne Corporation | Data telecommunication system |
US3937882A (en) * | 1974-04-11 | 1976-02-10 | Vadic Corporation | Full-duplex communication system on a two wire line |
US4031329A (en) * | 1974-06-13 | 1977-06-21 | International Telephone And Telegraph Corporation | Time limited telephone paging employs a relay switch actuated by dual frequency tone |
US3956601A (en) * | 1974-10-17 | 1976-05-11 | Paradyne Corporation | Telecommunications analyzer |
GB1540900A (en) * | 1975-06-30 | 1979-02-21 | Ericsson L M Pty Ltd | Digital testing and power control in a digital communication system |
DE2530633C3 (de) * | 1975-07-09 | 1979-04-05 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Verfahren zur automatischen Überprüfung der Funktionstüchtigkeit von Datenübertragungssystemen |
US4101833A (en) * | 1977-03-07 | 1978-07-18 | The Vadic Corporation | Duplex data transmission modem utilizing an injected tone for shifting power within the transmit spectrum |
FR2386202A1 (fr) * | 1977-03-31 | 1978-10-27 | Cit Alcatel | Dispositif de test en local pour un equipement de transmission de donnees duplex |
FR2404970A1 (fr) * | 1977-10-03 | 1979-04-27 | Sfena | Systeme de couplage pour transmission en duplex de donnees numeriques entre deux unites de traitement |
DE2807785A1 (de) * | 1978-02-23 | 1979-08-30 | Siemens Ag | Digitales nachrichtenuebertragungssystem |
DE2829076A1 (de) * | 1978-07-01 | 1980-01-10 | Tekade Felten & Guilleaume | Testanordnung fuer datenuebertragungsstrecken |
EP0014583A1 (fr) * | 1979-02-13 | 1980-08-20 | Macwell Systems Limited | Perfectionnements aux appareils de détection d'erreurs |
FR2476946A1 (fr) * | 1980-02-26 | 1981-08-28 | Thomson Csf | Modulateur-demodulateur a transfert de charges. |
FR2485306A1 (fr) * | 1980-06-23 | 1981-12-24 | Trt Telecom Radio Electr | Systeme de test local d'un modem utilisant la modulation par deplacement de frequence |
US4471489A (en) * | 1981-03-19 | 1984-09-11 | General Datacomm Industries, Inc. | Automatic answer/originate mode selection in modem |
US4481622A (en) * | 1982-04-01 | 1984-11-06 | Anderson Jacobson, Inc. | High speed dial-up telephone circuit full duplex data transmission techniques |
US4654881A (en) * | 1984-01-04 | 1987-03-31 | Motorola, Inc. | Remote control system having symmetrical tone, send/receive signaling circuits for radio communications |
US4660194A (en) * | 1984-04-05 | 1987-04-21 | New York Telephone Company | Method and apparatus for testing a subscriber's line circuit in a packet switched multiplexed data/voice communication system |
EP0176646B1 (fr) * | 1984-08-24 | 1988-07-20 | International Business Machines Corporation | Circuit d'interface de ligne |
US7133441B1 (en) * | 1999-02-23 | 2006-11-07 | Actelis Networks Inc. | High speed access system over copper cable plant |
KR100467587B1 (ko) * | 2002-06-07 | 2005-01-24 | 삼성전자주식회사 | 팩시 밀리의 자기 진단 방법 및 이 방법을 수행하는팩시밀리 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2864942A (en) * | 1955-03-11 | 1958-12-16 | Aircraft Radio Corp | Receiver tuning in two-way radio |
US2871289A (en) * | 1955-10-10 | 1959-01-27 | Gen Electric | Error-checking system |
US3049692A (en) * | 1957-07-15 | 1962-08-14 | Ibm | Error detection circuit |
-
1970
- 1970-05-07 US US35454A patent/US3655915A/en not_active Expired - Lifetime
-
1971
- 1971-03-03 CA CA106,773A patent/CA952197A/en not_active Expired
-
1972
- 1972-04-21 GB GB1869972A patent/GB1389939A/en not_active Expired
- 1972-08-30 BE BE788177A patent/BE788177Q/fr active
Also Published As
Publication number | Publication date |
---|---|
US3655915A (en) | 1972-04-11 |
GB1389939A (en) | 1975-04-09 |
CA952197A (en) | 1974-07-30 |
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