GB1521468A - Circuit arrangement for telephone subset - Google Patents
Circuit arrangement for telephone subsetInfo
- Publication number
- GB1521468A GB1521468A GB44059/74A GB4405974A GB1521468A GB 1521468 A GB1521468 A GB 1521468A GB 44059/74 A GB44059/74 A GB 44059/74A GB 4405974 A GB4405974 A GB 4405974A GB 1521468 A GB1521468 A GB 1521468A
- Authority
- GB
- United Kingdom
- Prior art keywords
- outpulsing
- circuit
- arrangement
- oct
- relay
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
1521468 Powering substations STANDARD TELEPHONES & CABLES Ltd 7 Oct 1975 [11 Oct 1974] 44059/74 Heading H4K In a circuit arrangement for a batteryless telephone instrument and including a full wave rectifying arrangement D1-4 adapted to power the instrument from the line, a capacitor C3 maintains power to the circuit during the break periods of outpulsing. The digits of a dialled call code, entered, e.g. at a key block, are transferred to a logic control circuit (not shown) where they are transformed into a pulse stream corresponding to the code. This stream is supplied (at the "Output Drive" terminal) to an arrangement, e.g. an outpulsing relay OPR, for effecting loop disconnect signalling. A clock generator provides timing information (over the "Clock Drive" leads) to the control circuit, which is reset at the start of each call. A transistor outpulsing circuit (TR21-23) may replace the outpulsing relay, Fig. 2 (not shown).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB44059/74A GB1521468A (en) | 1974-10-11 | 1974-10-11 | Circuit arrangement for telephone subset |
IE2205/75A IE41749B1 (en) | 1974-10-11 | 1975-10-08 | Circuit arrangement for tellephone subset |
ZA00756365A ZA756365B (en) | 1974-10-11 | 1975-10-08 | Circuit arrangement for telephone subset |
FR7531058A FR2287813A1 (en) | 1974-10-11 | 1975-10-10 | CIRCUIT FOR TELEPHONE SET WITH KEYPAD AND SIGNALING BY BREAK OF LOOP |
HK395/79A HK39579A (en) | 1974-10-11 | 1979-06-21 | Circuit arrangement for telephone subset |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB44059/74A GB1521468A (en) | 1974-10-11 | 1974-10-11 | Circuit arrangement for telephone subset |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1521468A true GB1521468A (en) | 1978-08-16 |
Family
ID=10431564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB44059/74A Expired GB1521468A (en) | 1974-10-11 | 1974-10-11 | Circuit arrangement for telephone subset |
Country Status (5)
Country | Link |
---|---|
FR (1) | FR2287813A1 (en) |
GB (1) | GB1521468A (en) |
HK (1) | HK39579A (en) |
IE (1) | IE41749B1 (en) |
ZA (1) | ZA756365B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2451690A1 (en) * | 1979-03-16 | 1980-10-10 | Horlogerie Photograph Fse | Pushbutton telephone set - has power consumption reduced by controlling supply to integrated circuit incorporating call number memory |
FR2505586A1 (en) * | 1981-05-05 | 1982-11-12 | Thomson Csf Mat Tel | Keyboard telephone receiver with stabilised power supply - contains transistors in series with supply to control open and short circuit condition of line during dialling |
FR2508744A1 (en) * | 1981-06-26 | 1982-12-31 | Thomson Csf Mat Tel | Pushbutton telephone with remote supply sound amplifier - has power supply in series with microphone and earphone terminal through control circuit and uses regulator for amplifier |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1394148A (en) * | 1972-09-11 | 1975-05-14 | Int Standard Electric Corp | Push-button telphone subset |
-
1974
- 1974-10-11 GB GB44059/74A patent/GB1521468A/en not_active Expired
-
1975
- 1975-10-08 ZA ZA00756365A patent/ZA756365B/en unknown
- 1975-10-08 IE IE2205/75A patent/IE41749B1/en unknown
- 1975-10-10 FR FR7531058A patent/FR2287813A1/en active Granted
-
1979
- 1979-06-21 HK HK395/79A patent/HK39579A/en unknown
Also Published As
Publication number | Publication date |
---|---|
HK39579A (en) | 1979-06-29 |
ZA756365B (en) | 1976-09-29 |
IE41749B1 (en) | 1980-03-12 |
IE41749L (en) | 1976-04-11 |
FR2287813A1 (en) | 1976-05-07 |
FR2287813B1 (en) | 1979-01-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19951006 |