JPS5658352A - Class identifying system in button telephone device - Google Patents

Class identifying system in button telephone device

Info

Publication number
JPS5658352A
JPS5658352A JP13450079A JP13450079A JPS5658352A JP S5658352 A JPS5658352 A JP S5658352A JP 13450079 A JP13450079 A JP 13450079A JP 13450079 A JP13450079 A JP 13450079A JP S5658352 A JPS5658352 A JP S5658352A
Authority
JP
Japan
Prior art keywords
class
voltage
resistor
comparators
terminals
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
JP13450079A
Other languages
Japanese (ja)
Inventor
Hiroshi Kuromori
Tatsuo Yoshida
Hideki Morimoto
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.)
Taiko Electric Works Ltd
Original Assignee
Taiko Electric Works 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 Taiko Electric Works Ltd filed Critical Taiko Electric Works Ltd
Priority to JP13450079A priority Critical patent/JPS5658352A/en
Publication of JPS5658352A publication Critical patent/JPS5658352A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/53—Generation of additional signals, e.g. additional pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To enable to identify the class of telephone set under connection, by inserting a resistor according to the class every telephone set in series to a hook switch, and comparing a voltage through the hook switch and the key corresponding to trunk line with the reference voltage. CONSTITUTION:A resistor R connected in series with a hook switch HS and terminals (a), (b), (c) are provided for class setting. Further, in a telephone set To, the terminals (b), (c) are connected for class set, then power is supplied to comparators Co, Co'. Taking the input voltage of comparators as Vo, a voltage by a resistor Ra in the reference voltages as Va, and voltage by a resistor (Ra+Rb) as Va+b, the relation of Vo>Va and Vo>Va+b is satisfied, and outputs Xo, Xo' of the comparators Co, Co' are both at ''1''. Next, the terminals (a), (c) are connected at class set, then Va, Va+b are selected so that Vo<Va and Vo>Va+b are satisfied, causing the output Xo, Xo' to be at ''0'' and ''1'' respectively, enabling the identification.
JP13450079A 1979-10-18 1979-10-18 Class identifying system in button telephone device Pending JPS5658352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13450079A JPS5658352A (en) 1979-10-18 1979-10-18 Class identifying system in button telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13450079A JPS5658352A (en) 1979-10-18 1979-10-18 Class identifying system in button telephone device

Publications (1)

Publication Number Publication Date
JPS5658352A true JPS5658352A (en) 1981-05-21

Family

ID=15129768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13450079A Pending JPS5658352A (en) 1979-10-18 1979-10-18 Class identifying system in button telephone device

Country Status (1)

Country Link
JP (1) JPS5658352A (en)

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