JPS6437153A - Trouble reporting and recovering device for public telephone - Google Patents

Trouble reporting and recovering device for public telephone

Info

Publication number
JPS6437153A
JPS6437153A JP19269787A JP19269787A JPS6437153A JP S6437153 A JPS6437153 A JP S6437153A JP 19269787 A JP19269787 A JP 19269787A JP 19269787 A JP19269787 A JP 19269787A JP S6437153 A JPS6437153 A JP S6437153A
Authority
JP
Japan
Prior art keywords
central office
trouble
relay
telephone set
public telephone
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
JP19269787A
Other languages
Japanese (ja)
Inventor
Junichi Nakagawa
Yuji Takamura
Shigekazu Matsushita
Osamu Miki
Shinichiro Aoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP19269787A priority Critical patent/JPS6437153A/en
Publication of JPS6437153A publication Critical patent/JPS6437153A/en
Pending legal-status Critical Current

Links

Landscapes

  • Prepayment Telephone Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To easily detect trouble of a public telephone in a central office and to easily recover the trouble detecting function by the central office at the time of the malfunction of this function by providing a trouble reporting means and a trouble detecting function recovering means. CONSTITUTION:If an abnormality detector in a telephone set is operated to detect abnormality, a transistor TR 8 is turned on and an error relay 3 is operated and a high resistance body 1 is inserted to a trunk line by its contact 2. The central office measures the resistance between terminals L1 and L2 in this state, and the central office judges the telephone set to be in the abnormal state if a high resistance value is detected. Meanwhile, when a recovery signal is sent from the central office, this signal is rectified by a diode bridge 5 and flows to the relay to release the relay 3. Thus, the contact 2 is opened to recover the speech system of the telephone set.
JP19269787A 1987-08-03 1987-08-03 Trouble reporting and recovering device for public telephone Pending JPS6437153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19269787A JPS6437153A (en) 1987-08-03 1987-08-03 Trouble reporting and recovering device for public telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19269787A JPS6437153A (en) 1987-08-03 1987-08-03 Trouble reporting and recovering device for public telephone

Publications (1)

Publication Number Publication Date
JPS6437153A true JPS6437153A (en) 1989-02-07

Family

ID=16295543

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19269787A Pending JPS6437153A (en) 1987-08-03 1987-08-03 Trouble reporting and recovering device for public telephone

Country Status (1)

Country Link
JP (1) JPS6437153A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57143969A (en) * 1981-02-28 1982-09-06 Anritsu Corp Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57143969A (en) * 1981-02-28 1982-09-06 Anritsu Corp Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit

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