GB2146201B - Loop detectors for telephone line circuits - Google Patents

Loop detectors for telephone line circuits

Info

Publication number
GB2146201B
GB2146201B GB08421481A GB8421481A GB2146201B GB 2146201 B GB2146201 B GB 2146201B GB 08421481 A GB08421481 A GB 08421481A GB 8421481 A GB8421481 A GB 8421481A GB 2146201 B GB2146201 B GB 2146201B
Authority
GB
United Kingdom
Prior art keywords
telephone line
line circuits
loop detectors
detectors
loop
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
GB08421481A
Other versions
GB2146201A (en
GB8421481D0 (en
Inventor
Peter David Hargreaves
Neil Carrol
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB8421481D0 publication Critical patent/GB8421481D0/en
Publication of GB2146201A publication Critical patent/GB2146201A/en
Application granted granted Critical
Publication of GB2146201B publication Critical patent/GB2146201B/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
    • H04M1/82—Line monitoring circuits for call progress or status discrimination
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
GB08421481A 1983-09-06 1984-08-24 Loop detectors for telephone line circuits Expired GB2146201B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838323875A GB8323875D0 (en) 1983-09-06 1983-09-06 Loop detectors

Publications (3)

Publication Number Publication Date
GB8421481D0 GB8421481D0 (en) 1984-09-26
GB2146201A GB2146201A (en) 1985-04-11
GB2146201B true GB2146201B (en) 1986-11-26

Family

ID=10548386

Family Applications (2)

Application Number Title Priority Date Filing Date
GB838323875A Pending GB8323875D0 (en) 1983-09-06 1983-09-06 Loop detectors
GB08421481A Expired GB2146201B (en) 1983-09-06 1984-08-24 Loop detectors for telephone line circuits

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB838323875A Pending GB8323875D0 (en) 1983-09-06 1983-09-06 Loop detectors

Country Status (1)

Country Link
GB (2) GB8323875D0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4805213A (en) * 1987-02-13 1989-02-14 Unison Technologies, Inc. Ring detector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB945103A (en) * 1961-08-24 1963-12-23 Automatic Telephone & Elect Improvements in or relating to communication systems
GB1504062A (en) * 1976-03-02 1978-03-15 Anaconda Co Loop current detector
NL7802422A (en) * 1978-03-06 1979-09-10 Philips Nv DEVICE FOR MEASURING THE LINE CONDITION OF A SUBSCRIBER'S LINE CURRENT USING A MEASURING RESISTOR.

Also Published As

Publication number Publication date
GB8323875D0 (en) 1983-10-05
GB2146201A (en) 1985-04-11
GB8421481D0 (en) 1984-09-26

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Legal Events

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