IT8024872A0 - Sistema di intercomunicazione - Google Patents
Sistema di intercomunicazioneInfo
- Publication number
- IT8024872A0 IT8024872A0 IT8024872A IT2487280A IT8024872A0 IT 8024872 A0 IT8024872 A0 IT 8024872A0 IT 8024872 A IT8024872 A IT 8024872A IT 2487280 A IT2487280 A IT 2487280A IT 8024872 A0 IT8024872 A0 IT 8024872A0
- Authority
- IT
- Italy
- Prior art keywords
- intercommunication system
- intercommunication
- Prior art date
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
- H04M1/715—Substation extension arrangements using two or more extensions per line
-
- 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
- H04M9/007—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 wherein the key telephone sets are star-connected to a central unit by a limited number of lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7907134A NL7907134A (nl) | 1979-09-25 | 1979-09-25 | Telefooninstallatie van de als sterpuntinstallatie aangeduide soort. |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8024872A0 true IT8024872A0 (it) | 1980-09-24 |
IT1149255B IT1149255B (it) | 1986-12-03 |
Family
ID=19833910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT24872/80A IT1149255B (it) | 1979-09-25 | 1980-09-24 | Sistema di intercomunicazione |
Country Status (10)
Country | Link |
---|---|
AU (1) | AU6265780A (it) |
DK (1) | DK403980A (it) |
ES (1) | ES8105913A1 (it) |
FI (1) | FI802986A (it) |
FR (1) | FR2466161A1 (it) |
GB (1) | GB2060316A (it) |
IT (1) | IT1149255B (it) |
NL (1) | NL7907134A (it) |
NO (1) | NO802825L (it) |
SE (1) | SE8006662L (it) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3000858C2 (de) * | 1980-01-11 | 1986-11-13 | Neumann Elektronik GmbH, 4330 Mülheim | Tastengesteuerte Wechsel-, Gegen- oder Lautsprechanlage |
US4744103A (en) * | 1985-11-27 | 1988-05-10 | Rauland-Borg Corporation | Computer controlled multi-link communication system |
IN167984B (it) * | 1986-09-23 | 1991-01-19 | Siemens Ag | |
US4769837A (en) * | 1987-05-04 | 1988-09-06 | Eoa Systems, Inc. | Device for adding intercom functions to a phone system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2139693B1 (it) * | 1971-05-28 | 1973-05-25 | Supravox Sarl | |
GB1369829A (en) * | 1971-12-23 | 1974-10-09 | Standard Telephones Cables Ltd | Electric impulse transmitters |
FR2285775A1 (fr) * | 1974-09-17 | 1976-04-16 | Berna Guy | Installation d'interphones a appels selectifs |
US4088846A (en) * | 1977-03-30 | 1978-05-09 | Bell Telephone Laboratories, Incorporated | Hold-plus-intercom for single-line stations |
-
1979
- 1979-09-25 NL NL7907134A patent/NL7907134A/nl not_active Application Discontinuation
-
1980
- 1980-09-22 FI FI802986A patent/FI802986A/fi not_active Application Discontinuation
- 1980-09-23 GB GB8030653A patent/GB2060316A/en not_active Withdrawn
- 1980-09-24 AU AU62657/80A patent/AU6265780A/en not_active Abandoned
- 1980-09-24 DK DK403980A patent/DK403980A/da unknown
- 1980-09-24 IT IT24872/80A patent/IT1149255B/it active
- 1980-09-24 NO NO802825A patent/NO802825L/no unknown
- 1980-09-24 FR FR8020536A patent/FR2466161A1/fr not_active Withdrawn
- 1980-09-24 SE SE8006662A patent/SE8006662L/ not_active Application Discontinuation
- 1980-09-25 ES ES495348A patent/ES8105913A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL7907134A (nl) | 1981-03-27 |
NO802825L (no) | 1981-03-26 |
AU6265780A (en) | 1981-04-09 |
ES495348A0 (es) | 1981-06-16 |
FI802986A (fi) | 1981-03-26 |
IT1149255B (it) | 1986-12-03 |
SE8006662L (sv) | 1981-03-26 |
FR2466161A1 (fr) | 1981-03-27 |
GB2060316A (en) | 1981-04-29 |
DK403980A (da) | 1981-03-26 |
ES8105913A1 (es) | 1981-06-16 |
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