JPS57206150A - Calling system - Google Patents

Calling system

Info

Publication number
JPS57206150A
JPS57206150A JP9181081A JP9181081A JPS57206150A JP S57206150 A JPS57206150 A JP S57206150A JP 9181081 A JP9181081 A JP 9181081A JP 9181081 A JP9181081 A JP 9181081A JP S57206150 A JPS57206150 A JP S57206150A
Authority
JP
Japan
Prior art keywords
relay
answer
iot
trunk
line
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
JP9181081A
Other languages
Japanese (ja)
Other versions
JPS6336704B2 (en
Inventor
Toshiyuki Kobayashi
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 JP9181081A priority Critical patent/JPS57206150A/en
Publication of JPS57206150A publication Critical patent/JPS57206150A/en
Publication of JPS6336704B2 publication Critical patent/JPS6336704B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To always allow the detection of an answer and to eliminate a signal device on another stage for a private exchange, by detecting a call with a single line of a paired telephone calling circuits of a relay device and then connecting the other line directly to a single line of a paired exchange telephone circuits. CONSTITUTION:When the calling starts, a battery is supplied to a line B from an intra-office trunk IOT to actuate a relay R. While the call signal given from a signal device SIG is transmitted from the trunk IOT. This is eqivalent to the fact that the battery for detection of answer shifts to a trunk TELT for a countermeasure for line unbalancing from the trunl IOT. When an extension telephone TEL gives an answer, the answer is directly detected by the relay RT of the trunk IOT. Thus the relay R is recovered. As a result, a relay J works with an answer loop of the telephone TEL. Then a relay B works. The answer loop is sent back to the trunk IOT via the contacts J<1> and b<1>.
JP9181081A 1981-06-15 1981-06-15 Calling system Granted JPS57206150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9181081A JPS57206150A (en) 1981-06-15 1981-06-15 Calling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9181081A JPS57206150A (en) 1981-06-15 1981-06-15 Calling system

Publications (2)

Publication Number Publication Date
JPS57206150A true JPS57206150A (en) 1982-12-17
JPS6336704B2 JPS6336704B2 (en) 1988-07-21

Family

ID=14036977

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9181081A Granted JPS57206150A (en) 1981-06-15 1981-06-15 Calling system

Country Status (1)

Country Link
JP (1) JPS57206150A (en)

Also Published As

Publication number Publication date
JPS6336704B2 (en) 1988-07-21

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