ES410234A1 - Circuito electronico mejorado para la retencion de llamada para sistemas de comunicaciones. - Google Patents
Circuito electronico mejorado para la retencion de llamada para sistemas de comunicaciones.Info
- Publication number
- ES410234A1 ES410234A1 ES410234A ES410234A ES410234A1 ES 410234 A1 ES410234 A1 ES 410234A1 ES 410234 A ES410234 A ES 410234A ES 410234 A ES410234 A ES 410234A ES 410234 A1 ES410234 A1 ES 410234A1
- Authority
- ES
- Spain
- Prior art keywords
- line
- call holding
- communication call
- constant current
- supervising 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
- H04M9/006—Exchange line circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
Circuito electrónico mejorado para la retención de llamada (10) para sistemas de comunicaciones (2) provisto de un par de conductores (13 y 14) ; un conmutador de transistor (18) para establecer un estado de retención a través de los conductores, y una disposición de control (7) para detectar las señales de control y aplicar y suprimir el estado de retención, caracterizado por comprender una puerta semiconductora (19) conectada en serie con el conmutador de transistor (18) para accionar el conmutador, un divisor de tensión (39,40 y 21) que comprende una fotorresistencia (39) acoplada por luz a la disposición de control para accionar la puerta semiconductora (19) y polarizar el conmutador de transistor (18) con el fin de regular una magnitud constante de corriente en la línea para la retención de llamada)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20965871A | 1971-12-20 | 1971-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES410234A1 true ES410234A1 (es) | 1975-12-01 |
Family
ID=22779696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES410234A Expired ES410234A1 (es) | 1971-12-20 | 1972-12-19 | Circuito electronico mejorado para la retencion de llamada para sistemas de comunicaciones. |
Country Status (10)
Country | Link |
---|---|
US (1) | US3742151A (es) |
JP (1) | JPS537088B2 (es) |
BE (1) | BE792984A (es) |
CA (1) | CA960388A (es) |
DE (1) | DE2261400C3 (es) |
ES (1) | ES410234A1 (es) |
FR (1) | FR2165608A5 (es) |
GB (1) | GB1410367A (es) |
IT (1) | IT976110B (es) |
SE (1) | SE386344B (es) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806665A (en) * | 1973-01-22 | 1974-04-23 | A Goldberg | Hold condition indicating reminder |
US3870831A (en) * | 1973-06-27 | 1975-03-11 | William I Mccarley | Telephone hold circuit |
JPS5117608A (ja) * | 1974-08-03 | 1976-02-12 | Taiko Electric Works Ltd | Botandenwasochi |
JPS5117607A (ja) * | 1974-08-03 | 1976-02-12 | Taiko Electric Works Ltd | Botandenwasochi |
JPS5121708A (ja) * | 1974-08-16 | 1976-02-21 | Taiko Electric Works Ltd | Botandenwasochi |
US3961142A (en) * | 1974-10-24 | 1976-06-01 | Caffine George S | Method and apparatus for automatically annunciating the completion of a telephone call hold interval |
US4001520A (en) * | 1975-02-20 | 1977-01-04 | Waldman Herbert H | Hold circuit for telephones |
US4004106A (en) * | 1975-06-25 | 1977-01-18 | Akzona Incorporated | Line circuit for use with a key telephone system |
US3997734A (en) * | 1975-11-24 | 1976-12-14 | Melco | Telephone hold attachment |
US4011413A (en) * | 1976-01-12 | 1977-03-08 | Gimix, Inc. | Hold circuit for telephone |
JPS5294005A (en) * | 1976-02-03 | 1977-08-08 | Nitsuko Ltd | Key telephone system |
US4093829A (en) * | 1977-03-14 | 1978-06-06 | Silberman Robert L | Single line telephone hold circuit |
FR2433866A2 (fr) * | 1978-08-17 | 1980-03-14 | Imberteche Rene | Perfectionnements au dispositif electromagnetique commandant les interconnexions des circuits de reception d'appel et de prise d'une installation telephonique |
US4198547A (en) * | 1978-09-26 | 1980-04-15 | Tele/Resources | Pulse circuit for two wire electronic PABX stations |
US4258232A (en) * | 1978-11-06 | 1981-03-24 | Tone Commander Systems, Inc. | Line hold circuits |
US4311880A (en) * | 1980-11-10 | 1982-01-19 | Bell Telephone Laboratories, Incorporated | Key telephone hold arrangement |
US4351987A (en) * | 1981-03-31 | 1982-09-28 | V-Band Systems, Inc. | Telephone line circuit hold arrangement |
JPS5933839U (ja) * | 1982-08-30 | 1984-03-02 | 株式会社森下機械製作所 | 軟ケ−ス用デパレツタイザ |
US4443665A (en) * | 1982-09-30 | 1984-04-17 | Alderman Robert J | Privacy and hold circuit for telephone |
US4445003A (en) * | 1982-09-30 | 1984-04-24 | Alderman Robert J | Improved connection arrangement for connecting series and shunt utilization circuit to a communications channel |
US4492822A (en) * | 1982-09-30 | 1985-01-08 | Alderman Robert J | Telephone hold circuit with improved self-limiting amplifier for injecting an audio signal during hold conditions |
JPS5964826U (ja) * | 1982-10-22 | 1984-04-28 | 澁谷工業株式会社 | デパレタイザ |
JPS6068151A (ja) * | 1984-07-09 | 1985-04-18 | Ube Ind Ltd | 射出成形装置用インサ−ト搬送方法 |
JP2868335B2 (ja) * | 1991-06-13 | 1999-03-10 | 富士通株式会社 | 交換機及び交換機における切断通知方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3395256A (en) * | 1965-07-29 | 1968-07-30 | Bell Telephone Labor Inc | Key telephone control systems |
US3420963A (en) * | 1965-07-30 | 1969-01-07 | Bell Telephone Labor Inc | Communication system line circuit particularly for key telephone systems |
US3410961A (en) * | 1965-10-12 | 1968-11-12 | Bell Telephone Labor Inc | Line circuit for a telephone system having optical solid state means |
-
0
- BE BE792984D patent/BE792984A/xx unknown
-
1971
- 1971-12-20 US US00209658A patent/US3742151A/en not_active Expired - Lifetime
-
1972
- 1972-07-06 CA CA146,495A patent/CA960388A/en not_active Expired
- 1972-12-13 SE SE7216276A patent/SE386344B/xx unknown
- 1972-12-15 DE DE2261400A patent/DE2261400C3/de not_active Expired
- 1972-12-19 ES ES410234A patent/ES410234A1/es not_active Expired
- 1972-12-19 FR FR7245254A patent/FR2165608A5/fr not_active Expired
- 1972-12-19 IT IT70995/72A patent/IT976110B/it active
- 1972-12-20 JP JP12733372A patent/JPS537088B2/ja not_active Expired
- 1972-12-20 GB GB5874372A patent/GB1410367A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2261400A1 (de) | 1973-07-05 |
CA960388A (en) | 1974-12-31 |
IT976110B (it) | 1974-08-20 |
FR2165608A5 (es) | 1973-08-03 |
GB1410367A (en) | 1975-10-15 |
BE792984A (fr) | 1973-04-16 |
US3742151A (en) | 1973-06-26 |
SE386344B (sv) | 1976-08-02 |
JPS4871108A (es) | 1973-09-26 |
DE2261400B2 (de) | 1975-01-09 |
DE2261400C3 (de) | 1975-08-21 |
JPS537088B2 (es) | 1978-03-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 19840227 |