KR970008932B1 - Alarm circuit of small switching system - Google Patents

Alarm circuit of small switching system Download PDF

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Publication number
KR970008932B1
KR970008932B1 KR91000541A KR910000541A KR970008932B1 KR 970008932 B1 KR970008932 B1 KR 970008932B1 KR 91000541 A KR91000541 A KR 91000541A KR 910000541 A KR910000541 A KR 910000541A KR 970008932 B1 KR970008932 B1 KR 970008932B1
Authority
KR
South Korea
Prior art keywords
alarm
alarm circuit
switching system
voltage
small switching
Prior art date
Application number
KR91000541A
Other languages
Korean (ko)
Other versions
KR920015790A (en
Inventor
Tae-Kyu Kil
Original Assignee
Lg Inf & Comm 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 Lg Inf & Comm Ltd filed Critical Lg Inf & Comm Ltd
Priority to KR91000541A priority Critical patent/KR970008932B1/en
Publication of KR920015790A publication Critical patent/KR920015790A/en
Application granted granted Critical
Publication of KR970008932B1 publication Critical patent/KR970008932B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

Alarm circuit for postal switching device, consists of a bridge diode that full-wave rectifies the power through the general telephone line and connects the general telephone line with the alarm circuit in parallel, a voltage input means that applies the voltage of proper level from the bridge diode, a alarm signal generating means that output the alarm signal when alarm switch is pressed according to providing the operation voltage from the voltage input means, and a line alarm control means.
KR91000541A 1991-01-15 1991-01-15 Alarm circuit of small switching system KR970008932B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR91000541A KR970008932B1 (en) 1991-01-15 1991-01-15 Alarm circuit of small switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR91000541A KR970008932B1 (en) 1991-01-15 1991-01-15 Alarm circuit of small switching system

Publications (2)

Publication Number Publication Date
KR920015790A KR920015790A (en) 1992-08-27
KR970008932B1 true KR970008932B1 (en) 1997-06-03

Family

ID=19309818

Family Applications (1)

Application Number Title Priority Date Filing Date
KR91000541A KR970008932B1 (en) 1991-01-15 1991-01-15 Alarm circuit of small switching system

Country Status (1)

Country Link
KR (1) KR970008932B1 (en)

Also Published As

Publication number Publication date
KR920015790A (en) 1992-08-27

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E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee