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JPS57173252A - Releasing system for automatic answering trunk - Google Patents

Releasing system for automatic answering trunk

Info

Publication number
JPS57173252A
JPS57173252A JP5720181A JP5720181A JPS57173252A JP S57173252 A JPS57173252 A JP S57173252A JP 5720181 A JP5720181 A JP 5720181A JP 5720181 A JP5720181 A JP 5720181A JP S57173252 A JPS57173252 A JP S57173252A
Authority
JP
Japan
Prior art keywords
aat
contact
trunk
automatic answering
releasing
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
JP5720181A
Other languages
Japanese (ja)
Inventor
Mutsuo Ikuta
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5720181A priority Critical patent/JPS57173252A/en
Publication of JPS57173252A publication Critical patent/JPS57173252A/en
Pending 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
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To obtain a releasing system for an automatic answering trunk applicable to even a telephone system of a last party releasing system by repeating answering and disconnection after the automatic answering trunk has answered. CONSTITUTION:The contact (aat) of a relay which repeats interruption at constant intervals of time is inserted into the loop of an automatic answering trunk AAT. In response to the breaking of the contact (aat), the monitoring element B of an incoming trunk ICT turns off, and its contact (b) has a normal and a reverse state repeatedly for a preceding station. When the contact (aat) is broken, the B truns off and through its ocntact (b), an on-hook signal is sent out to the preceding station for prescribed timing. At this time, when a calling subscriber puts the handset on the hook, an originating station receives the on- hook signal from a terminating station, so the releasing logic of a channel is applicable to a telephone network of a last party release system.
JP5720181A 1981-04-17 1981-04-17 Releasing system for automatic answering trunk Pending JPS57173252A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5720181A JPS57173252A (en) 1981-04-17 1981-04-17 Releasing system for automatic answering trunk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5720181A JPS57173252A (en) 1981-04-17 1981-04-17 Releasing system for automatic answering trunk

Publications (1)

Publication Number Publication Date
JPS57173252A true JPS57173252A (en) 1982-10-25

Family

ID=13048876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5720181A Pending JPS57173252A (en) 1981-04-17 1981-04-17 Releasing system for automatic answering trunk

Country Status (1)

Country Link
JP (1) JPS57173252A (en)

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