JPS55159664A - Network control circuit - Google Patents

Network control circuit

Info

Publication number
JPS55159664A
JPS55159664A JP6688379A JP6688379A JPS55159664A JP S55159664 A JPS55159664 A JP S55159664A JP 6688379 A JP6688379 A JP 6688379A JP 6688379 A JP6688379 A JP 6688379A JP S55159664 A JPS55159664 A JP S55159664A
Authority
JP
Japan
Prior art keywords
relay
circuit
terminal
contacts
contact
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
JP6688379A
Other languages
Japanese (ja)
Other versions
JPS6358420B2 (en
Inventor
Koichi Ooyama
Satoru Ono
Isao Kawashima
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.)
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
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 Iwatsu Electric Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Iwatsu Electric Co Ltd
Priority to JP6688379A priority Critical patent/JPS55159664A/en
Publication of JPS55159664A publication Critical patent/JPS55159664A/en
Publication of JPS6358420B2 publication Critical patent/JPS6358420B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Abstract

PURPOSE:To simplify the circuit and to make the circuit small in size with less number of components, by commonly using the relays as many as possible for those used in the network control circuit performing the prevention of collision of outgoing and incoming calls and the detection of response of other parties, in a communication line. CONSTITUTION:A selection signal transmission circuit 2 is controlled with contacts m1,m2 of the relay M connected between the + terminal L2 and the - terminal L1 of office line, contact P of the relay P and contact q of the relay Q for prevention of collison of incoming and outgoing call of a communication line and detection of the response of other party. The control of the contacts m1m2,q and p in this circuit is made at the control circuit 4 of relays. The relay P is operated with the request of calling at the terminal to close the contacts p,p2,p3. Further, at non-incoming call, the terminal L1 is kept at -48V and the terminal L2 is grounded, and the relay P is self-held without operation of the relay TCK by back bias of the diode D2, and the relay M is actuated with a slight delay with the delay circuit 5 and the contact p4, and self-hole is made with the contact m4 and the transistor TR to form DC loop with the operation of the contacts m1m,2.
JP6688379A 1979-05-31 1979-05-31 Network control circuit Granted JPS55159664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6688379A JPS55159664A (en) 1979-05-31 1979-05-31 Network control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6688379A JPS55159664A (en) 1979-05-31 1979-05-31 Network control circuit

Publications (2)

Publication Number Publication Date
JPS55159664A true JPS55159664A (en) 1980-12-11
JPS6358420B2 JPS6358420B2 (en) 1988-11-15

Family

ID=13328724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6688379A Granted JPS55159664A (en) 1979-05-31 1979-05-31 Network control circuit

Country Status (1)

Country Link
JP (1) JPS55159664A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57136853A (en) * 1981-02-19 1982-08-24 Fujitsu Ltd Prevention system for origination and termination collision
JPS58219695A (en) * 1982-06-15 1983-12-21 日通工株式会社 Automatic announcing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240905A (en) * 1975-09-29 1977-03-30 Oki Electric Ind Co Ltd Transmissin-reception anticollision system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240905A (en) * 1975-09-29 1977-03-30 Oki Electric Ind Co Ltd Transmissin-reception anticollision system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57136853A (en) * 1981-02-19 1982-08-24 Fujitsu Ltd Prevention system for origination and termination collision
JPS6316940B2 (en) * 1981-02-19 1988-04-12 Fujitsu Kk
JPS58219695A (en) * 1982-06-15 1983-12-21 日通工株式会社 Automatic announcing apparatus

Also Published As

Publication number Publication date
JPS6358420B2 (en) 1988-11-15

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