FR2281018A1 - Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel - Google Patents

Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel

Info

Publication number
FR2281018A1
FR2281018A1 FR7426845A FR7426845A FR2281018A1 FR 2281018 A1 FR2281018 A1 FR 2281018A1 FR 7426845 A FR7426845 A FR 7426845A FR 7426845 A FR7426845 A FR 7426845A FR 2281018 A1 FR2281018 A1 FR 2281018A1
Authority
FR
France
Prior art keywords
channel
violation
signals
high speed
signal
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
Application number
FR7426845A
Other languages
French (fr)
Other versions
FR2281018B1 (en
Inventor
Claude Raymond Chilard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Priority to FR7426845A priority Critical patent/FR2281018A1/en
Publication of FR2281018A1 publication Critical patent/FR2281018A1/en
Application granted granted Critical
Publication of FR2281018B1 publication Critical patent/FR2281018B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

One channel carries high speed digital data while the second carries low speed data. Digital data signals (Sd) on the main channel are coded by transition (1) from one digital state to the other state and the biphase signal (2) is also obtained. A sequence detector (3) through which two successive high or low signal states may be transmitted as a signal violation is followed by a violation signal pulse signal pulse generator (4) and separator (5). Selected violation signals are transmitted (6) by line to a receiver comprising a monostable (8) with clock (9). Main channel signals (Sd) are decoded (10) and auxiliary signals (Sa) are obtained b integration (12) of a violation detector (11) output.
FR7426845A 1974-08-02 1974-08-02 Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel Granted FR2281018A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7426845A FR2281018A1 (en) 1974-08-02 1974-08-02 Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7426845A FR2281018A1 (en) 1974-08-02 1974-08-02 Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel

Publications (2)

Publication Number Publication Date
FR2281018A1 true FR2281018A1 (en) 1976-02-27
FR2281018B1 FR2281018B1 (en) 1980-07-25

Family

ID=9142021

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7426845A Granted FR2281018A1 (en) 1974-08-02 1974-08-02 Base band modem for two channel data transmissions - has high speed channel and low speed signalling channel

Country Status (1)

Country Link
FR (1) FR2281018A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605473A1 (en) * 1986-10-15 1988-04-22 Hewlett Packard France Sa METHOD AND APPARATUS FOR ENCODING AND DECODING BINARY INFORMATION
EP0376335A2 (en) * 1988-12-28 1990-07-04 Hitachi, Ltd. Digital transmission system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605473A1 (en) * 1986-10-15 1988-04-22 Hewlett Packard France Sa METHOD AND APPARATUS FOR ENCODING AND DECODING BINARY INFORMATION
EP0266285A1 (en) * 1986-10-15 1988-05-04 Hewlett-Packard France Method and apparatus for encoding and decoding binary information
EP0376335A2 (en) * 1988-12-28 1990-07-04 Hitachi, Ltd. Digital transmission system
EP0376335A3 (en) * 1988-12-28 1990-09-12 Hitachi, Ltd. Digital transmission system

Also Published As

Publication number Publication date
FR2281018B1 (en) 1980-07-25

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Legal Events

Date Code Title Description
ST Notification of lapse