NO155598C - PHONE INSTALLATION CIRCUIT. - Google Patents
PHONE INSTALLATION CIRCUIT.Info
- Publication number
- NO155598C NO155598C NO811094A NO811094A NO155598C NO 155598 C NO155598 C NO 155598C NO 811094 A NO811094 A NO 811094A NO 811094 A NO811094 A NO 811094A NO 155598 C NO155598 C NO 155598C
- Authority
- NO
- Norway
- Prior art keywords
- ringing
- signal bus
- line
- lines
- group
- Prior art date
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
- H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange
Abstract
1. Method of providing ringing signals the composition and duration of which are determined by ringing circuits (74-78) and by ringing supervision circuits (122-124) for a plurality of telecommunication lines (42 to 48) interconnectable via a switching network, the connection status of said lines being supervised line by line and said lines being connectable group by group, via a common ringing signal bus (82), to a common ringing circuit (74-78) and connected group by group each with a ringing answering detector (122), especially for digital telephone switching systems in which the analogic number lines are connected to the switching network via line termination circuits (12) in which conversion takes place between the analog signals on the subscriber line and the digital signals in the switching network, characterized in, that in the ringing circuit (74-78) a.c. voltages of different frequencies (f1 to f4), generated from several ringing signal reference voltage sources (100 to 106), are transmitted to the common ringing signal bus (82) as an amplified a.c. ringing voltage depending on control signals provided by ringing interval detectors (124), that the ringing a.c. voltages are supplied to the connecting circuits (50 to 56) of the corresponding group (0) of telecommunication lines (42 to 48) via the ringing signal bus (82), that the control signals supplied by the ringing interval detectors (124) are also supplied to the connecting circuits (50 to 56) of the corresponding group (0) of telecommunication lines (42 to 48), that in the connecting circuits (50 to 56) each individual telecommunication line is connected to the ringing signal bus (82) at the correct time on the basis of the control signals formed by the ringing interval detector (124) depending on the ringing status on the ringing signal bus (82), and that in the corresponding connecting circuit (50-56) the connecting of a telecommunication line to be run to the ringing signal bus is controlled in such a way that the telecommunication line receives immediate ringing by this path.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13575680A | 1980-03-31 | 1980-03-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO811094L NO811094L (en) | 1981-10-01 |
| NO155598B NO155598B (en) | 1987-01-12 |
| NO155598C true NO155598C (en) | 1987-04-22 |
Family
ID=22469517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO811094A NO155598C (en) | 1980-03-31 | 1981-03-31 | PHONE INSTALLATION CIRCUIT. |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0037540B1 (en) |
| JP (1) | JPS56152361A (en) |
| AT (1) | ATE17294T1 (en) |
| AU (1) | AU541648B2 (en) |
| BE (1) | BE888193A (en) |
| BR (1) | BR8101844A (en) |
| CA (1) | CA1172737A (en) |
| DE (1) | DE3173346D1 (en) |
| ES (1) | ES8206125A1 (en) |
| MX (1) | MX150197A (en) |
| NO (1) | NO155598C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128449B (en) * | 1982-10-08 | 1985-12-11 | Standard Telephones Cables Ltd | Tone generation circuit |
| US4656659A (en) * | 1985-07-18 | 1987-04-07 | Itt Corporation | Programmable ring signal generator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2129281A5 (en) * | 1971-03-11 | 1972-10-27 | Ibm France | |
| US4097694A (en) * | 1975-07-09 | 1978-06-27 | Toa Electric Company, Ltd. | Time-division telephone system embodying trunks having demodulating-adder circuits |
| JPS53124008A (en) * | 1977-04-06 | 1978-10-30 | Oki Electric Ind Co Ltd | Call signal transmission system |
-
1981
- 1981-03-26 AU AU68765/81A patent/AU541648B2/en not_active Ceased
- 1981-03-26 MX MX186568A patent/MX150197A/en unknown
- 1981-03-27 BR BR8101844A patent/BR8101844A/en not_active IP Right Cessation
- 1981-03-28 DE DE8181102363T patent/DE3173346D1/en not_active Expired
- 1981-03-28 AT AT81102363T patent/ATE17294T1/en not_active IP Right Cessation
- 1981-03-28 EP EP81102363A patent/EP0037540B1/en not_active Expired
- 1981-03-30 CA CA000374135A patent/CA1172737A/en not_active Expired
- 1981-03-31 JP JP4658281A patent/JPS56152361A/en active Granted
- 1981-03-31 BE BE2/59088A patent/BE888193A/en not_active IP Right Cessation
- 1981-03-31 ES ES500922A patent/ES8206125A1/en not_active Expired
- 1981-03-31 NO NO811094A patent/NO155598C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU6876581A (en) | 1981-10-08 |
| BE888193A (en) | 1981-09-30 |
| EP0037540A3 (en) | 1982-09-15 |
| ES500922A0 (en) | 1982-08-16 |
| ES8206125A1 (en) | 1982-08-16 |
| DE3173346D1 (en) | 1986-02-13 |
| EP0037540B1 (en) | 1986-01-02 |
| ATE17294T1 (en) | 1986-01-15 |
| AU541648B2 (en) | 1985-01-17 |
| CA1172737A (en) | 1984-08-14 |
| JPH0342534B2 (en) | 1991-06-27 |
| NO155598B (en) | 1987-01-12 |
| EP0037540A2 (en) | 1981-10-14 |
| NO811094L (en) | 1981-10-01 |
| MX150197A (en) | 1984-03-29 |
| BR8101844A (en) | 1981-10-06 |
| JPS56152361A (en) | 1981-11-25 |
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