JPS5612189A - Multiplexer - Google Patents

Multiplexer

Info

Publication number
JPS5612189A
JPS5612189A JP8721079A JP8721079A JPS5612189A JP S5612189 A JPS5612189 A JP S5612189A JP 8721079 A JP8721079 A JP 8721079A JP 8721079 A JP8721079 A JP 8721079A JP S5612189 A JPS5612189 A JP S5612189A
Authority
JP
Japan
Prior art keywords
lgm
communication channel
tty
mctl
constitution
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
JP8721079A
Other languages
Japanese (ja)
Inventor
Yoshitsugu Watanabe
Kiyoshi Abe
Kazuo Tsuzuki
Masayuki Koyama
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 JP8721079A priority Critical patent/JPS5612189A/en
Publication of JPS5612189A publication Critical patent/JPS5612189A/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)
  • Time-Division Multiplex Systems (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

PURPOSE:To reduce the hardware of a control system by enabling in-use/stand-by switching automatically at a communication channel side. CONSTITUTION:Holding memory LGM is composed of rewritable RAM and controller MCTL which writes information in LGM is connected so as to rewrite externally the contents of LGM through input unit TTY, thereby performing the connection switching of channels. Since LGM uses RAM, an electric power failure, etc., erases the contents of LGM and it takes much time to make a reconnection, so redundant constitution of one system, two systems, etc. with divided electric power feed is employed. In addition to the redundant constitution of one or two systems of a communication channel, a common circuit is provided previously and this common circuit displays a fault on alarm display circuit ALD and further operates in-use/ stand-by change-over circuit ACT/SBY to change communication channel over. As a result, the need to connect expensive MCTL and TTY to the communication channel all the time is eliminated and only each one MCTL and TTY are needed for multiplexers.
JP8721079A 1979-07-10 1979-07-10 Multiplexer Pending JPS5612189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8721079A JPS5612189A (en) 1979-07-10 1979-07-10 Multiplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8721079A JPS5612189A (en) 1979-07-10 1979-07-10 Multiplexer

Publications (1)

Publication Number Publication Date
JPS5612189A true JPS5612189A (en) 1981-02-06

Family

ID=13908573

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8721079A Pending JPS5612189A (en) 1979-07-10 1979-07-10 Multiplexer

Country Status (1)

Country Link
JP (1) JPS5612189A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6354898U (en) * 1986-09-30 1988-04-13
JPH0220137A (en) * 1988-07-08 1990-01-23 Hitachi Ltd Subscriber line multiple converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6354898U (en) * 1986-09-30 1988-04-13
JPH0220137A (en) * 1988-07-08 1990-01-23 Hitachi Ltd Subscriber line multiple converter

Similar Documents

Publication Publication Date Title
JP2002515606A5 (en)
JPS6469127A (en) High speed switching system
JPS5612189A (en) Multiplexer
JPS5614302A (en) Process control system
JPS5320824A (en) Trouble diagnosis isolation system for memory unit
JPS5725734A (en) Party call receiver
JPS5567252A (en) Stand-by circuit switching system
JPS57136239A (en) Device address switching system
JPS54105417A (en) Redundancy constitution system of channel shift switch of time-division switchboard
JPS5340207A (en) Stand-by unit switching system
JPS57117043A (en) Digital operation control device
SU1032602A1 (en) Three-channel redunancy device
SU788463A1 (en) Redundant device
SU1102069A1 (en) Device for control of changing over to reserve facility
JPS57185731A (en) Line switching circuit
JP2549363B2 (en) Initial value display
JPS5380929A (en) Memory unit
JPS57111728A (en) Multiscanning device
JPS61206012A (en) Power source control device
JPS55123286A (en) Switching system of electronic switchboard control part
JPS5781655A (en) Switching system for now-in-use and stand-by decvices
JPS5619253A (en) Fault detecting system
JPS5676824A (en) Network interface system
IT1212389B (en) Exchange with program controlled central control - has main control unit and reserve unit which has access to data channels only when active
JPS5674723A (en) Double control system