CA939091A - Long-line telephone circuit - Google Patents

Long-line telephone circuit

Info

Publication number
CA939091A
CA939091A CA121930A CA121930A CA939091A CA 939091 A CA939091 A CA 939091A CA 121930 A CA121930 A CA 121930A CA 121930 A CA121930 A CA 121930A CA 939091 A CA939091 A CA 939091A
Authority
CA
Canada
Prior art keywords
long
telephone circuit
line telephone
line
circuit
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
CA121930A
Other versions
CA121930S (en
Inventor
M. Cambridge Ronan
Chytil Milan
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 Technology Corp
Original Assignee
Bell Canada Northern Electric Research 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 Bell Canada Northern Electric Research Ltd filed Critical Bell Canada Northern Electric Research Ltd
Priority to CA121930A priority Critical patent/CA939091A/en
Application granted granted Critical
Publication of CA939091A publication Critical patent/CA939091A/en
Expired 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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/006—Circuits for increasing the range of current supply source

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
CA121930A 1971-09-01 1971-09-01 Long-line telephone circuit Expired CA939091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA121930A CA939091A (en) 1971-09-01 1971-09-01 Long-line telephone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA121930A CA939091A (en) 1971-09-01 1971-09-01 Long-line telephone circuit

Publications (1)

Publication Number Publication Date
CA939091A true CA939091A (en) 1973-12-25

Family

ID=4090765

Family Applications (1)

Application Number Title Priority Date Filing Date
CA121930A Expired CA939091A (en) 1971-09-01 1971-09-01 Long-line telephone circuit

Country Status (1)

Country Link
CA (1) CA939091A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809547A (en) * 1978-09-19 1980-03-21 Nederlanden Staat Four wire telephone connection of remote extension to PBX - has two stable conditions for speech amplification on line with repeaters and transmitters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809547A (en) * 1978-09-19 1980-03-21 Nederlanden Staat Four wire telephone connection of remote extension to PBX - has two stable conditions for speech amplification on line with repeaters and transmitters

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