JPS57143969A - Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit - Google Patents

Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

Info

Publication number
JPS57143969A
JPS57143969A JP2876581A JP2876581A JPS57143969A JP S57143969 A JPS57143969 A JP S57143969A JP 2876581 A JP2876581 A JP 2876581A JP 2876581 A JP2876581 A JP 2876581A JP S57143969 A JPS57143969 A JP S57143969A
Authority
JP
Japan
Prior art keywords
fault
circuit
public telephone
current
fault signal
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
JP2876581A
Other languages
Japanese (ja)
Other versions
JPH0157861B2 (en
Inventor
Hiroyuki Takahashi
Takao Saito
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.)
Anritsu Corp
Original Assignee
Anritsu 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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP2876581A priority Critical patent/JPS57143969A/en
Publication of JPS57143969A publication Critical patent/JPS57143969A/en
Publication of JPH0157861B2 publication Critical patent/JPH0157861B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/24—Arrangements for supervision, monitoring or testing with provision for checking the normal operation
    • H04M3/248—Arrangements for supervision, monitoring or testing with provision for checking the normal operation for metering arrangements or prepayment telephone systems

Abstract

PURPOSE:To detect the occurrence of a fault without remodeling a switchboard itself, by flowing a line current when a public telephone set is used, or an intermediate line when the set is not used when the fault is detected. CONSTITUTION:When a fault is detected by the fault detecting circuit 31 of a public telephone set 2, a line current when the telephone set 2 is not used is converted by a current control circuit 32 into a presribed value less than a minumum line current when a switchboard is actuated, and greater than that when the switchboard recovers. This conversion is carried out by making a relay contact by energizing a detection relay 33. On the other hand, the current levels of lines L1 and L2 are monitored by the fault signal monitoring circuit 4 of an exchange all the time, and the current value converted into the prescribed value by the circuit 32 is detected by the circuit 4. Thus, the monitoring circuit which discriminates the value of the line current is only connected in series to the lines L1 and L2 to detect the occurrence of a fault in the public telephone set.
JP2876581A 1981-02-28 1981-02-28 Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit Granted JPS57143969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2876581A JPS57143969A (en) 1981-02-28 1981-02-28 Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2876581A JPS57143969A (en) 1981-02-28 1981-02-28 Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

Publications (2)

Publication Number Publication Date
JPS57143969A true JPS57143969A (en) 1982-09-06
JPH0157861B2 JPH0157861B2 (en) 1989-12-07

Family

ID=12257494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2876581A Granted JPS57143969A (en) 1981-02-28 1981-02-28 Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

Country Status (1)

Country Link
JP (1) JPS57143969A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6437153A (en) * 1987-08-03 1989-02-07 Nippon Telegraph & Telephone Trouble reporting and recovering device for public telephone
JPS6444665A (en) * 1987-08-12 1989-02-17 Nippon Telegraph & Telephone Public telephone remote monitor system
JPH0720748U (en) * 1983-12-30 1995-04-11 エイ・ティ・アンド・ティ・コーポレーション Coin phone

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52146915U (en) * 1976-04-30 1977-11-08
JPS5578663A (en) * 1978-12-08 1980-06-13 Oki Electric Ind Co Ltd Remote control system for public telephone set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52146915U (en) * 1976-04-30 1977-11-08
JPS5578663A (en) * 1978-12-08 1980-06-13 Oki Electric Ind Co Ltd Remote control system for public telephone set

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0720748U (en) * 1983-12-30 1995-04-11 エイ・ティ・アンド・ティ・コーポレーション Coin phone
JPS6437153A (en) * 1987-08-03 1989-02-07 Nippon Telegraph & Telephone Trouble reporting and recovering device for public telephone
JPS6444665A (en) * 1987-08-12 1989-02-17 Nippon Telegraph & Telephone Public telephone remote monitor system
JPH0552108B2 (en) * 1987-08-12 1993-08-04 Nippon Telegraph & Telephone

Also Published As

Publication number Publication date
JPH0157861B2 (en) 1989-12-07

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