JPS56140759A - Network controller for telephone circuit - Google Patents

Network controller for telephone circuit

Info

Publication number
JPS56140759A
JPS56140759A JP4212380A JP4212380A JPS56140759A JP S56140759 A JPS56140759 A JP S56140759A JP 4212380 A JP4212380 A JP 4212380A JP 4212380 A JP4212380 A JP 4212380A JP S56140759 A JPS56140759 A JP S56140759A
Authority
JP
Japan
Prior art keywords
signal
telephone circuit
network controller
cml
sent
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.)
Pending
Application number
JP4212380A
Other languages
Japanese (ja)
Inventor
Yasuhisa Sakurai
Masaaki Watanabe
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4212380A priority Critical patent/JPS56140759A/en
Publication of JPS56140759A publication Critical patent/JPS56140759A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/08Indicating faults in circuits or apparatus

Abstract

PURPOSE:To prevent an ineffective use of the telephone network, by receiving the signal transmitted from a telephone circuit network controller of a faulty electronic computer or the like at the telephone circuit network controller of one side and thus controlling the working of automatic dialing. CONSTITUTION:When the communication becomes impossible due to a fault of an electronic computer or the like, the call signal arrives at the terminals L1 and L2 of a telephone circuit to detect the fault through the incoming detecting part 1. As a result, the relay CML works to switch the contacts cml<0> and cml<1> for closure of the communication line. On the other hand, the relay TR works, and at the same time the communication incapability information signal is sent to the telephone circuit from the communication incapability signal sending part 5. This signal is detected by the opposite telephone circuit network controller and through the information incapable signal detecting part 4, and this output is sent to the alarm controlling part 7. Thus an alarm is given to the external operation board through the terminal RA, and at the same time the signal is sent to the automatic calling level converting part 8 to turn on the interface signal DLO. Thus an automatic dialing action is inhibited.
JP4212380A 1980-04-01 1980-04-01 Network controller for telephone circuit Pending JPS56140759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4212380A JPS56140759A (en) 1980-04-01 1980-04-01 Network controller for telephone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4212380A JPS56140759A (en) 1980-04-01 1980-04-01 Network controller for telephone circuit

Publications (1)

Publication Number Publication Date
JPS56140759A true JPS56140759A (en) 1981-11-04

Family

ID=12627165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4212380A Pending JPS56140759A (en) 1980-04-01 1980-04-01 Network controller for telephone circuit

Country Status (1)

Country Link
JP (1) JPS56140759A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62155664A (en) * 1985-12-27 1987-07-10 Matsushita Graphic Commun Syst Inc Modem

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62155664A (en) * 1985-12-27 1987-07-10 Matsushita Graphic Commun Syst Inc Modem

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