JPS553245A - Detecting system for state change of subscriber line - Google Patents

Detecting system for state change of subscriber line

Info

Publication number
JPS553245A
JPS553245A JP7566078A JP7566078A JPS553245A JP S553245 A JPS553245 A JP S553245A JP 7566078 A JP7566078 A JP 7566078A JP 7566078 A JP7566078 A JP 7566078A JP S553245 A JPS553245 A JP S553245A
Authority
JP
Japan
Prior art keywords
subscriber line
memory
circuit
line state
renewal
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.)
Granted
Application number
JP7566078A
Other languages
Japanese (ja)
Other versions
JPS5719918B2 (en
Inventor
Masami Sengoku
Katsuhiko Haruta
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7566078A priority Critical patent/JPS553245A/en
Publication of JPS553245A publication Critical patent/JPS553245A/en
Publication of JPS5719918B2 publication Critical patent/JPS5719918B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/72—Finding out and indicating number of calling subscriber

Abstract

PURPOSE:To avoid the loss of the line state changing information to the pointer setting of the system switching time due to occurrence of the fault by performing renewal of the last-look memory after the reading via the queue register in the detecting system for the state change of the subscriber line for the exchange. CONSTITUTION:Present-look memory 300 memorizes periodically the scanning results of the subscriber line state, and last-look memory 310 memorizes the subscriber line state which was scanned precedingly. In addition to these memories, queue register 350 is installed to memorize in sequence the comparison results between memory 300 and 310. In the exchange of such constitution, the output of subscriber line change detection circuit 330 is applied to ACTM renewal circuit 390, and furthermore the output of pointer initial setting circuit 380 is applied to circuit 390. And no renewal is given to the contents of memory 310 until the memory information of register 350 is read out. Thus, the loss of the subscriber line state change information can be avoided for the queue pointer switch setting.
JP7566078A 1978-06-21 1978-06-21 Detecting system for state change of subscriber line Granted JPS553245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7566078A JPS553245A (en) 1978-06-21 1978-06-21 Detecting system for state change of subscriber line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7566078A JPS553245A (en) 1978-06-21 1978-06-21 Detecting system for state change of subscriber line

Publications (2)

Publication Number Publication Date
JPS553245A true JPS553245A (en) 1980-01-11
JPS5719918B2 JPS5719918B2 (en) 1982-04-24

Family

ID=13582597

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7566078A Granted JPS553245A (en) 1978-06-21 1978-06-21 Detecting system for state change of subscriber line

Country Status (1)

Country Link
JP (1) JPS553245A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5755689A (en) * 1980-09-22 1982-04-02 Nec Corp Monitoring circuit for subscriber signal
JPS6074795A (en) * 1983-09-30 1985-04-27 Fujitsu Ltd Signal reception circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241615A1 (en) * 1982-11-10 1984-05-10 Audi Nsu Auto Union Ag, 7107 Neckarsulm METHOD FOR ASSEMBLY OF FINISHED SKIES IN VEHICLES AND DEVICE FOR IMPLEMENTING THE METHOD

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5755689A (en) * 1980-09-22 1982-04-02 Nec Corp Monitoring circuit for subscriber signal
JPS6074795A (en) * 1983-09-30 1985-04-27 Fujitsu Ltd Signal reception circuit

Also Published As

Publication number Publication date
JPS5719918B2 (en) 1982-04-24

Similar Documents

Publication Publication Date Title
JPS553245A (en) Detecting system for state change of subscriber line
JPS5538757A (en) Picture magnification/reduction system
JPS5741739A (en) Program renewal control system
JPS55134442A (en) Data transfer unit
JPS54106133A (en) Buffer memory fault control system
JPS57143654A (en) Memory sequence extending circuit
JPS5752256A (en) Traffic observation system for electronic switchboard
JPS5576446A (en) Pre-fetch control system
JPS54109738A (en) Fault diagnosis system for duplicating central process system
JPS5545247A (en) Signal receiving unit
JPS54144150A (en) Information processing system
JPS5556262A (en) Operation hysteresis retention system
JPS5452947A (en) Control system for central processor
JPS5525820A (en) Buffer memory device
JPS55121763A (en) Circuit scanning process system for communication control unit
JPS5520542A (en) Automatic registering system
JPS57162199A (en) Scan out system
JPS5654699A (en) Fault detecting system
JPS5573996A (en) Address control system
JPS5597073A (en) Memory control system
JPS57211874A (en) Picture data processing system
JPS54139446A (en) Process mode control unit
JPS5674760A (en) Data trace system
JPS55140944A (en) Microorder address storing device
JPS5534739A (en) Microprogram control unit