FR2314621A1 - Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels - Google Patents

Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels

Info

Publication number
FR2314621A1
FR2314621A1 FR7518183A FR7518183A FR2314621A1 FR 2314621 A1 FR2314621 A1 FR 2314621A1 FR 7518183 A FR7518183 A FR 7518183A FR 7518183 A FR7518183 A FR 7518183A FR 2314621 A1 FR2314621 A1 FR 2314621A1
Authority
FR
France
Prior art keywords
channels
omnibus
frequency band
subtraction
effected
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
FR7518183A
Other languages
French (fr)
Other versions
FR2314621B1 (en
Inventor
Andre Comte
Jean-Claude Duval
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Priority to FR7518183A priority Critical patent/FR2314621A1/en
Publication of FR2314621A1 publication Critical patent/FR2314621A1/en
Application granted granted Critical
Publication of FR2314621B1 publication Critical patent/FR2314621B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/08—Arrangements for combining channels

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Amplifiers (AREA)

Abstract

Telephonic channels are transmitted on a single coaxial cable with repeaters using frequency division multiplexing. In one direction a lower frequency band is used while a higher frequency band is used in the other direction. Direct and omnibus channels are available. The omnibus channel groups can be added or removed without loss of the corresponding frequency band and are obtained using a derivation circuit coupled (40, 41) to the transmission line (5). Each input is connected to an amplifier (42, 52) followed by a coupler (43, 53) permitting connection (44, 54) to the omnibus channels of the lower (44) or upper (54) frequency band. The couplers are followed by filters (46, 56) and amplifiers (47, 57) which with the input amplifiers (42, 52) permit compensation for direct channel attenuation. A second coupler (49, 59) receives inputs (50, 60) from the omnibus channels.
FR7518183A 1975-06-11 1975-06-11 Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels Granted FR2314621A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7518183A FR2314621A1 (en) 1975-06-11 1975-06-11 Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7518183A FR2314621A1 (en) 1975-06-11 1975-06-11 Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels

Publications (2)

Publication Number Publication Date
FR2314621A1 true FR2314621A1 (en) 1977-01-07
FR2314621B1 FR2314621B1 (en) 1977-12-09

Family

ID=9156333

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7518183A Granted FR2314621A1 (en) 1975-06-11 1975-06-11 Addition and subtraction of relay channels to transmission system - is effected in frequency multiplexed transposition system without affecting direct channels

Country Status (1)

Country Link
FR (1) FR2314621A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1285557B (en) * 1966-09-30 1968-12-19 Siemens Ag Method and branching device for branching off small channel groups from broadband carrier frequency systems

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1285557B (en) * 1966-09-30 1968-12-19 Siemens Ag Method and branching device for branching off small channel groups from broadband carrier frequency systems

Also Published As

Publication number Publication date
FR2314621B1 (en) 1977-12-09

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Legal Events

Date Code Title Description
ST Notification of lapse