JPS5652960A - Digital conference telephone connection system - Google Patents

Digital conference telephone connection system

Info

Publication number
JPS5652960A
JPS5652960A JP12974679A JP12974679A JPS5652960A JP S5652960 A JPS5652960 A JP S5652960A JP 12974679 A JP12974679 A JP 12974679A JP 12974679 A JP12974679 A JP 12974679A JP S5652960 A JPS5652960 A JP S5652960A
Authority
JP
Japan
Prior art keywords
telephone
time sharing
conference telephone
connection system
highway
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
JP12974679A
Other languages
Japanese (ja)
Other versions
JPS6343942B2 (en
Inventor
Masaaki Ito
Shuichi Ashihara
Mitsutoshi Ayano
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12974679A priority Critical patent/JPS5652960A/en
Publication of JPS5652960A publication Critical patent/JPS5652960A/en
Publication of JPS6343942B2 publication Critical patent/JPS6343942B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/561—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities by multiplexing

Abstract

PURPOSE:To remove the level attenuating multiplier and economize the unit, by executing the signal level control of a channel to be connected with the conference telephone system by means of the time sharing digital variable transmission loss device mounted in the time sharing network. CONSTITUTION:It is supported that four subscribers A-D are on the conference telephone by connecting the telephone sets to the conference telephone connection system CFC through the time sharing networks TD-SW, respectively. In this case, a call signal from the telephone set A is digitized after two-wire and four-wire conversion by the subscriber's circuit LCa, is multiplexed to the incoming highway I HW1 together with a call signal of the transmission side from other telephone set by the multiplexer/demultiplexer MDUX1, is transmitted, reaches the space switch S-SW through the primary time switch T-SW11, furthermore is sent to the secondary time switch T-SW2n through the intermediate highway C HWbn by the time sharing digital variable transmission loss insertion device SDPn, is separated by MDUXn through the outgoing highway 0 HWn, and is input to the conference telephone connection system CFC. The telephone sets B-D are also processed in the same way.
JP12974679A 1979-10-08 1979-10-08 Digital conference telephone connection system Granted JPS5652960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12974679A JPS5652960A (en) 1979-10-08 1979-10-08 Digital conference telephone connection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12974679A JPS5652960A (en) 1979-10-08 1979-10-08 Digital conference telephone connection system

Publications (2)

Publication Number Publication Date
JPS5652960A true JPS5652960A (en) 1981-05-12
JPS6343942B2 JPS6343942B2 (en) 1988-09-01

Family

ID=15017172

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12974679A Granted JPS5652960A (en) 1979-10-08 1979-10-08 Digital conference telephone connection system

Country Status (1)

Country Link
JP (1) JPS5652960A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153367A (en) * 1983-02-21 1984-09-01 Hitachi Ltd Level control conference communication system
JPS6074861A (en) * 1983-08-18 1985-04-27 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Conference connecting method and circuit
JPS6190565A (en) * 1984-10-11 1986-05-08 Iwatsu Electric Co Ltd Conference calling system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153367A (en) * 1983-02-21 1984-09-01 Hitachi Ltd Level control conference communication system
JPS6074861A (en) * 1983-08-18 1985-04-27 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Conference connecting method and circuit
JPH0573094B2 (en) * 1983-08-18 1993-10-13 Philips Nv
JPS6190565A (en) * 1984-10-11 1986-05-08 Iwatsu Electric Co Ltd Conference calling system
JPH0237152B2 (en) * 1984-10-11 1990-08-22 Iwatsu Electric Co Ltd

Also Published As

Publication number Publication date
JPS6343942B2 (en) 1988-09-01

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