JPS577686A - Prevention system for failure in recovery from fault of manual holding circuit - Google Patents

Prevention system for failure in recovery from fault of manual holding circuit

Info

Publication number
JPS577686A
JPS577686A JP8195280A JP8195280A JPS577686A JP S577686 A JPS577686 A JP S577686A JP 8195280 A JP8195280 A JP 8195280A JP 8195280 A JP8195280 A JP 8195280A JP S577686 A JPS577686 A JP S577686A
Authority
JP
Japan
Prior art keywords
circuit
telephone switchboard
signal
fault
ans
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
JP8195280A
Other languages
Japanese (ja)
Other versions
JPS6349949B2 (en
Inventor
Katsuhiko Furukawa
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 JP8195280A priority Critical patent/JPS577686A/en
Publication of JPS577686A publication Critical patent/JPS577686A/en
Publication of JPS6349949B2 publication Critical patent/JPS6349949B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/02—Selecting arrangements for multiplex systems for frequency-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To connect a manual holding circuit to a telephone switchboard via a carrier device by preventing the arrival of a new call from an originating telephone switchboard by a blocking-signal sending function on the basis of fault information from a telephone switchboard at a carrier device or incoming side. CONSTITUTION:Electronic detectors A-DECT of signal converters SC1-SC24 detect an incoming call by closing a loop on a call line by an originating telephone switchboard, and consequently a common control signal processing circuit COM- CONT is put in operation through a corresponding terminal M. Through this operation, a start signal sent from a carrier multiplexing circuit MU through the multiplexing circuit SIG-MUX for control signals of a carrier multiplexer MUX. When an answer signal is sent from an incoming telephone switchboard, the circuit COM- CONT is put in operation through the circuit SIG-MUX to send a signal from a corresponding terminal E to a relay DRV, and then an electromagnetic relay ANS is operated to switch the contact ans of the relay ANS. As a result, the polarity of a loop monitoring circuit for channels is inverted to prevent a failure in recovery from the fault of a manual holding circuit.
JP8195280A 1980-06-17 1980-06-17 Prevention system for failure in recovery from fault of manual holding circuit Granted JPS577686A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8195280A JPS577686A (en) 1980-06-17 1980-06-17 Prevention system for failure in recovery from fault of manual holding circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8195280A JPS577686A (en) 1980-06-17 1980-06-17 Prevention system for failure in recovery from fault of manual holding circuit

Publications (2)

Publication Number Publication Date
JPS577686A true JPS577686A (en) 1982-01-14
JPS6349949B2 JPS6349949B2 (en) 1988-10-06

Family

ID=13760829

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8195280A Granted JPS577686A (en) 1980-06-17 1980-06-17 Prevention system for failure in recovery from fault of manual holding circuit

Country Status (1)

Country Link
JP (1) JPS577686A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695178A (en) * 1985-07-30 1987-09-22 Okabe Co., Ltd. Joint for reinforcing bar employed in concrete construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695178A (en) * 1985-07-30 1987-09-22 Okabe Co., Ltd. Joint for reinforcing bar employed in concrete construction

Also Published As

Publication number Publication date
JPS6349949B2 (en) 1988-10-06

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