JPS5624894A - Connection control system - Google Patents

Connection control system

Info

Publication number
JPS5624894A
JPS5624894A JP10056679A JP10056679A JPS5624894A JP S5624894 A JPS5624894 A JP S5624894A JP 10056679 A JP10056679 A JP 10056679A JP 10056679 A JP10056679 A JP 10056679A JP S5624894 A JPS5624894 A JP S5624894A
Authority
JP
Japan
Prior art keywords
pulse
calling extension
break
processor
trunk
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
JP10056679A
Other languages
Japanese (ja)
Inventor
Takeo Tawada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP10056679A priority Critical patent/JPS5624894A/en
Publication of JPS5624894A publication Critical patent/JPS5624894A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To detect abnormal pulses accurately, by connecting a scanner, which detects the break time width of the dial pulse transmitted from the calling extension connected to the central office trunk, and a memory unit to the processor. CONSTITUTION:The calling extension is scanned at every 8 milliseconds for the purpose of counting the break time width of the dial pulse transmitted from the calling extension connected to central office trunk CBWT in central processor CP. For every scanning period, it is decided whether the calling extension is transmitting a make pulse or a break pulse; and the counter in memory unit M is cleared to the initial value, namely, ''0'' for the make pulse, and the counter is counted up by 1 for the break pulse. When processor CP discriminates a pulse as the abnormal pulse, the calling extension is forcedly set to the lock-out state, and the calling extension is connected to the trunk which issues a specific announce or tone.
JP10056679A 1979-08-06 1979-08-06 Connection control system Pending JPS5624894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10056679A JPS5624894A (en) 1979-08-06 1979-08-06 Connection control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10056679A JPS5624894A (en) 1979-08-06 1979-08-06 Connection control system

Publications (1)

Publication Number Publication Date
JPS5624894A true JPS5624894A (en) 1981-03-10

Family

ID=14277456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10056679A Pending JPS5624894A (en) 1979-08-06 1979-08-06 Connection control system

Country Status (1)

Country Link
JP (1) JPS5624894A (en)

Similar Documents

Publication Publication Date Title
US5327493A (en) Device for detecting tones on telephone lines
CA2078599A1 (en) Method and apparatus for monitoring a network for customer signaling during the term of a call
JPS6470898A (en) Interactive type alarm reporting system with monitoring
JPS6441799A (en) Device for adjusting counter for operating time fuse of projectile in digital system
PL331486A1 (en) Call-fee counter for use in a wireless telephone system
US4741022A (en) Remote subscriber interaction system
JPS5624894A (en) Connection control system
CA2042682A1 (en) Over-current detector circuit for an enhanced subscriber line interface
CA1135885A (en) Ringing signal generator
EP0033162B1 (en) Digital tone ringer
SE8505399L (en) SYSTEM FOR INTERACTIVE COOPERATION WITH REMOTE CONNECTORS
JPS5762663A (en) Facsimile receiver
JPS5490470A (en) Signal transmission system
EP0360724A3 (en) Method for monitoring telephone status changes
JPS579161A (en) Imposition control system for public telephone
JPS5549065A (en) Charging pulse transmission system
EP0353739A3 (en) Telephone-call distributor
JPS6489660A (en) Remote control system for facsimile equipment
JPS5528692A (en) Automatic response unit for automatic answering telephone
JPS5484442A (en) Information transmission system
JPS6427347A (en) Telephone set having holding alarm function
JPS6429157A (en) Hook detection circuit
JPS5643860A (en) Signal discrimination system of circuit terminal
JPS642464A (en) Select signal system setting device of communication controller
JPS6489855A (en) Facsimile equipment