JPS57154964A - Call monitoring system - Google Patents

Call monitoring system

Info

Publication number
JPS57154964A
JPS57154964A JP4003981A JP4003981A JPS57154964A JP S57154964 A JPS57154964 A JP S57154964A JP 4003981 A JP4003981 A JP 4003981A JP 4003981 A JP4003981 A JP 4003981A JP S57154964 A JPS57154964 A JP S57154964A
Authority
JP
Japan
Prior art keywords
subscriber
switch
time
subscribers
information
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
JP4003981A
Other languages
Japanese (ja)
Inventor
Toshio Katsuki
Shuji 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.)
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 JP4003981A priority Critical patent/JPS57154964A/en
Publication of JPS57154964A publication Critical patent/JPS57154964A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

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

Abstract

PURPOSE:To realize the call monitoring at an optional place, by setting the channels of a subscriber or a monitor request subscriber by means of a time shared switchboard via a multi-subscriber channel trunk and then converting the aural information given from the monitor request subscriber into a soundless data at the input side of the multi-subscriber channel trunk. CONSTITUTION:When a subscriber C monitors the channels of subscribers A and B, the request information of the monitor request subscriber C is connected to a multi-subscriber channel trunk TWT via a central controller and controlled to be written into control memories PTC1-PTC4 of primary time switches PTS1-PTS4 respectively. At the same time, the subscribers A and B are connected to a secondary time switch STS4 of the input side of the trunk TWT via a space switch SSW through time slots TSalpha and TSbeta, and the subscriber C is connected to the switch STS4 in the same way through a time slot TSgamma. Then the call information of the subscriber C is written into the switch PT4 through a switch PT3, and the subscribers A and B are prevented from hearing the voiceless data in place of the information of the time slot TSgamma. In such way, the monitoring is possible.
JP4003981A 1981-03-19 1981-03-19 Call monitoring system Pending JPS57154964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4003981A JPS57154964A (en) 1981-03-19 1981-03-19 Call monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4003981A JPS57154964A (en) 1981-03-19 1981-03-19 Call monitoring system

Publications (1)

Publication Number Publication Date
JPS57154964A true JPS57154964A (en) 1982-09-24

Family

ID=12569762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4003981A Pending JPS57154964A (en) 1981-03-19 1981-03-19 Call monitoring system

Country Status (1)

Country Link
JP (1) JPS57154964A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991769A (en) * 1982-11-17 1984-05-26 Fujitsu Ltd Line monitoring system
JPH03178252A (en) * 1989-12-07 1991-08-02 Fujitsu Ltd Voice adder circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54109709A (en) * 1978-02-17 1979-08-28 Nec Corp Verification system
JPS55138955A (en) * 1979-04-17 1980-10-30 Hitachi Ltd Time sharing channel interruption system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54109709A (en) * 1978-02-17 1979-08-28 Nec Corp Verification system
JPS55138955A (en) * 1979-04-17 1980-10-30 Hitachi Ltd Time sharing channel interruption system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991769A (en) * 1982-11-17 1984-05-26 Fujitsu Ltd Line monitoring system
JPH03178252A (en) * 1989-12-07 1991-08-02 Fujitsu Ltd Voice adder circuit

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