JPS55136758A - Restoration system for communication line - Google Patents

Restoration system for communication line

Info

Publication number
JPS55136758A
JPS55136758A JP4400879A JP4400879A JPS55136758A JP S55136758 A JPS55136758 A JP S55136758A JP 4400879 A JP4400879 A JP 4400879A JP 4400879 A JP4400879 A JP 4400879A JP S55136758 A JPS55136758 A JP S55136758A
Authority
JP
Japan
Prior art keywords
tdm
relay
contact
tandem
station
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
JP4400879A
Other languages
Japanese (ja)
Inventor
Isamu Murase
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 JP4400879A priority Critical patent/JPS55136758A/en
Publication of JPS55136758A publication Critical patent/JPS55136758A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To restore the line of multi-stage relay only by the transmission station, by giving the monitor circuit for communication time limit and the release means making ineffective it at the outgoing trunk of the exchanger performing tandem relay. CONSTITUTION:The tandem relay TDM of a tendem station is operated in the path of T0 terminal -tc<o> contact-relay of TDM-cell from the marker via the trunk block connector and holds in the path of ground-b<2> contact-tdm<1> contact-TDM relay-cell. When this TDM relay is operative, since the time monitor circuit of communication time limit is cut off with the tdm<0> contact, the restoration of line is not made at the tandem station.
JP4400879A 1979-04-11 1979-04-11 Restoration system for communication line Pending JPS55136758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4400879A JPS55136758A (en) 1979-04-11 1979-04-11 Restoration system for communication line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4400879A JPS55136758A (en) 1979-04-11 1979-04-11 Restoration system for communication line

Publications (1)

Publication Number Publication Date
JPS55136758A true JPS55136758A (en) 1980-10-24

Family

ID=12679663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4400879A Pending JPS55136758A (en) 1979-04-11 1979-04-11 Restoration system for communication line

Country Status (1)

Country Link
JP (1) JPS55136758A (en)

Similar Documents

Publication Publication Date Title
JPS51144111A (en) Echo cancelling method
JPS55136758A (en) Restoration system for communication line
JPS5429504A (en) Simultaneous service system for audio and date communication
JPS52129208A (en) Circuit switching system for transmission network
JPS5358705A (en) Switching system for transmission line
JPS5249716A (en) Two-way transmission system
JPS538512A (en) Facsimile communication system
JPS5255417A (en) Automatic exchange connection system
JPS53116703A (en) Communication control unit
JPS5781753A (en) Improved double-telephone device
JPS54119814A (en) Composite exchange system
JPS5276805A (en) Telephone service system
JPS5320544A (en) Carrier protecting relays
JPS51138845A (en) Pilot wire relay system
JPS549516A (en) Fault reception system
JPS54152410A (en) Informaton transmission system
JPS52102607A (en) Remote device control system
JPS54129911A (en) Switching system equipped with remote station
JPS55137756A (en) Transmission system of service time prediction alarm tone
JPS53101910A (en) Subscriber&#39;s circuit
JPS5384511A (en) Line concentrator
JPS53140904A (en) Discriminating system for connection of international communication
JPS52137910A (en) Link matching system
JPS54158107A (en) Night main telephone swtiching system
JPS5321402A (en) Automatic operating device of pump