GB2209907B - Telephone ringing circuit - Google Patents

Telephone ringing circuit

Info

Publication number
GB2209907B
GB2209907B GB8818487A GB8818487A GB2209907B GB 2209907 B GB2209907 B GB 2209907B GB 8818487 A GB8818487 A GB 8818487A GB 8818487 A GB8818487 A GB 8818487A GB 2209907 B GB2209907 B GB 2209907B
Authority
GB
United Kingdom
Prior art keywords
ringing circuit
telephone ringing
telephone
circuit
ringing
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 - Fee Related
Application number
GB8818487A
Other versions
GB2209907A (en
GB8818487D0 (en
Inventor
Peter David Hargreaves
Anthony James Chatterton
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.)
Telent Technologies Services Ltd
Plessey Telecommunications Ltd
Original Assignee
Telent Technologies Services Ltd
Plessey Telecommunications 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 Telent Technologies Services Ltd, Plessey Telecommunications Ltd filed Critical Telent Technologies Services Ltd
Publication of GB8818487D0 publication Critical patent/GB8818487D0/en
Publication of GB2209907A publication Critical patent/GB2209907A/en
Application granted granted Critical
Publication of GB2209907B publication Critical patent/GB2209907B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
GB8818487A 1987-09-10 1988-08-03 Telephone ringing circuit Expired - Fee Related GB2209907B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878721322A GB8721322D0 (en) 1987-09-10 1987-09-10 Telephone ringing circuit

Publications (3)

Publication Number Publication Date
GB8818487D0 GB8818487D0 (en) 1988-09-07
GB2209907A GB2209907A (en) 1989-05-24
GB2209907B true GB2209907B (en) 1991-05-29

Family

ID=10623578

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878721322A Pending GB8721322D0 (en) 1987-09-10 1987-09-10 Telephone ringing circuit
GB8818487A Expired - Fee Related GB2209907B (en) 1987-09-10 1988-08-03 Telephone ringing circuit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878721322A Pending GB8721322D0 (en) 1987-09-10 1987-09-10 Telephone ringing circuit

Country Status (1)

Country Link
GB (2) GB8721322D0 (en)

Also Published As

Publication number Publication date
GB2209907A (en) 1989-05-24
GB8721322D0 (en) 1987-10-14
GB8818487D0 (en) 1988-09-07

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Legal Events

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

Effective date: 19920803