CA1173576A - Circuit de ligne telephonique a clavier - Google Patents

Circuit de ligne telephonique a clavier

Info

Publication number
CA1173576A
CA1173576A CA000403188A CA403188A CA1173576A CA 1173576 A CA1173576 A CA 1173576A CA 000403188 A CA000403188 A CA 000403188A CA 403188 A CA403188 A CA 403188A CA 1173576 A CA1173576 A CA 1173576A
Authority
CA
Canada
Prior art keywords
relay
line
circuit
called station
hold
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.)
Expired
Application number
CA000403188A
Other languages
English (en)
Inventor
Paul Y. Ho
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to CA000403188A priority Critical patent/CA1173576A/fr
Priority to US06/381,080 priority patent/US4445004A/en
Application granted granted Critical
Publication of CA1173576A publication Critical patent/CA1173576A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/006—Exchange line circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
CA000403188A 1982-05-18 1982-05-18 Circuit de ligne telephonique a clavier Expired CA1173576A (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA000403188A CA1173576A (fr) 1982-05-18 1982-05-18 Circuit de ligne telephonique a clavier
US06/381,080 US4445004A (en) 1982-05-18 1982-05-24 Key telephone line circuit with improved hold circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40318882A 1982-05-18 1982-05-18
CA000403188A CA1173576A (fr) 1982-05-18 1982-05-18 Circuit de ligne telephonique a clavier

Publications (1)

Publication Number Publication Date
CA1173576A true CA1173576A (fr) 1984-08-28

Family

ID=25669685

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000403188A Expired CA1173576A (fr) 1982-05-18 1982-05-18 Circuit de ligne telephonique a clavier

Country Status (1)

Country Link
CA (1) CA1173576A (fr)

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Legal Events

Date Code Title Description
MKEC Expiry (correction)
MKEX Expiry