GB2021358B - Line state detection circuit - Google Patents

Line state detection circuit

Info

Publication number
GB2021358B
GB2021358B GB7916180A GB7916180A GB2021358B GB 2021358 B GB2021358 B GB 2021358B GB 7916180 A GB7916180 A GB 7916180A GB 7916180 A GB7916180 A GB 7916180A GB 2021358 B GB2021358 B GB 2021358B
Authority
GB
United Kingdom
Prior art keywords
detection circuit
state detection
line state
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
GB7916180A
Other versions
GB2021358A (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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB2021358A publication Critical patent/GB2021358A/en
Application granted granted Critical
Publication of GB2021358B publication Critical patent/GB2021358B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current
    • 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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
GB7916180A 1978-05-17 1979-05-10 Line state detection circuit Expired GB2021358B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7814536A FR2426370A1 (en) 1978-05-17 1978-05-17 TRANSMISSION LINE STATUS DETECTION CIRCUIT

Publications (2)

Publication Number Publication Date
GB2021358A GB2021358A (en) 1979-11-28
GB2021358B true GB2021358B (en) 1982-04-21

Family

ID=9208313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7916180A Expired GB2021358B (en) 1978-05-17 1979-05-10 Line state detection circuit

Country Status (2)

Country Link
FR (1) FR2426370A1 (en)
GB (1) GB2021358B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501940B1 (en) * 1981-03-11 1985-07-19 Trt Telecom Radio Electr LONGITUDINAL VOLTAGE LOOP DETECTOR
HU192925B (en) * 1985-03-29 1987-08-28 Bhg Hiradastech Vallalat Circuit arrangement for realizing circuit sensing state of loop, in particular to processor controlled digital sub-exchanges
CN102346478B (en) * 2011-09-08 2013-04-03 重庆长安汽车股份有限公司 Circuit and method for detecting failures in data acquisition of overall controller of automobile

Also Published As

Publication number Publication date
FR2426370B3 (en) 1980-12-19
FR2426370A1 (en) 1979-12-14
GB2021358A (en) 1979-11-28

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee