JPS56132890A - Outgoing call restriction and detection system - Google Patents

Outgoing call restriction and detection system

Info

Publication number
JPS56132890A
JPS56132890A JP3608480A JP3608480A JPS56132890A JP S56132890 A JPS56132890 A JP S56132890A JP 3608480 A JP3608480 A JP 3608480A JP 3608480 A JP3608480 A JP 3608480A JP S56132890 A JPS56132890 A JP S56132890A
Authority
JP
Japan
Prior art keywords
call
outgoing
outgoing call
contact
ineffective
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
JP3608480A
Other languages
Japanese (ja)
Inventor
Tomio Zama
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 JP3608480A priority Critical patent/JPS56132890A/en
Publication of JPS56132890A publication Critical patent/JPS56132890A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

PURPOSE:To avoid the ineffective processing in an early time from the detection of outgoing call to the channel block, by controlling the subscribing line monitor scanner if outgoing lines are all in use and avoiding to detect the calling of other subscribers located in the switch. CONSTITUTION:Even if the subscriber telephone set 1 makes outgoing call, when the primary switch outgoing lines are all in use, since no vacant channels are selected, a series of processing from the detection of outgoing call to the selection of channels is made ineffective. The state of usage of the primary switch outgoing lines is monitored in a given period and if they are all in use, the signal distributor (SD)17 is controlled and the SD relay 15 is driven to open the SD contact 14. With this state, if call is made from the subscriber telephone set 1, the line relay contact 13 is closed or the SD contact 14 is open, then the call is not detected, allowing ineffective processing.
JP3608480A 1980-03-24 1980-03-24 Outgoing call restriction and detection system Pending JPS56132890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3608480A JPS56132890A (en) 1980-03-24 1980-03-24 Outgoing call restriction and detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3608480A JPS56132890A (en) 1980-03-24 1980-03-24 Outgoing call restriction and detection system

Publications (1)

Publication Number Publication Date
JPS56132890A true JPS56132890A (en) 1981-10-17

Family

ID=12459874

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3608480A Pending JPS56132890A (en) 1980-03-24 1980-03-24 Outgoing call restriction and detection system

Country Status (1)

Country Link
JP (1) JPS56132890A (en)

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