GB2055021B - Telephone line circuit - Google Patents

Telephone line circuit

Info

Publication number
GB2055021B
GB2055021B GB7925775A GB7925775A GB2055021B GB 2055021 B GB2055021 B GB 2055021B GB 7925775 A GB7925775 A GB 7925775A GB 7925775 A GB7925775 A GB 7925775A GB 2055021 B GB2055021 B GB 2055021B
Authority
GB
United Kingdom
Prior art keywords
telephone line
line circuit
circuit
telephone
line
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
GB7925775A
Other versions
GB2055021A (en
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.)
Microsemi Semiconductor ULC
Original Assignee
Mitel Corp
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 Mitel Corp filed Critical Mitel Corp
Priority to GB7925775A priority Critical patent/GB2055021B/en
Publication of GB2055021A publication Critical patent/GB2055021A/en
Application granted granted Critical
Publication of GB2055021B publication Critical patent/GB2055021B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/586—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using an electronic circuit
    • 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
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB7925775A 1979-07-24 1979-07-24 Telephone line circuit Expired GB2055021B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7925775A GB2055021B (en) 1979-07-24 1979-07-24 Telephone line circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7925775A GB2055021B (en) 1979-07-24 1979-07-24 Telephone line circuit

Publications (2)

Publication Number Publication Date
GB2055021A GB2055021A (en) 1981-02-18
GB2055021B true GB2055021B (en) 1983-03-30

Family

ID=10506730

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7925775A Expired GB2055021B (en) 1979-07-24 1979-07-24 Telephone line circuit

Country Status (1)

Country Link
GB (1) GB2055021B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1182230A (en) * 1982-12-17 1985-02-05 Patrick R. Beirne Subscriber line interface circuit
CA1231480A (en) * 1985-03-15 1988-01-12 John A. Barsellotti Constant current line circuit
EP0254116A3 (en) * 1986-07-23 1989-09-13 Siemens Aktiengesellschaft Circuit arrangement for adaptation of a two-wire subscriber line circuit for the connection with a coupling device with single wire interconnection in telephone exchanges, especially private branch exchanges

Also Published As

Publication number Publication date
GB2055021A (en) 1981-02-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee