ES8105913A1 - Intercom system - Google Patents
Intercom systemInfo
- Publication number
- ES8105913A1 ES8105913A1 ES495348A ES495348A ES8105913A1 ES 8105913 A1 ES8105913 A1 ES 8105913A1 ES 495348 A ES495348 A ES 495348A ES 495348 A ES495348 A ES 495348A ES 8105913 A1 ES8105913 A1 ES 8105913A1
- Authority
- ES
- Spain
- Prior art keywords
- processing unit
- common
- central office
- office line
- telephone sets
- 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
-
- 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)
- Monitoring And Testing Of Exchanges (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
An intercommunication system for use with at least two telephone sets, each connected through a four- wire (2 for speech, 2 for control signals) cable to a common processing unit located at the customer's premises. Each telephone set in addition to the conventional selecting means comprising a plurality of select keys equal in number to the maximum number of telephone sets for which said processing unit is designed for selectively calling through said processing unit by optical and audio signals any of the telephone sets for intercommunication through a common line, a central office line key for establishing a connection to a common central office line, and for taking over a call transferred from another telephone set of the system, and optical signal reproducing means. Said common processing unit being adapted to accomplish all the necessary switching and signalling functions for handling intercommunicating traffic and traffic through the central office line.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7907134A NL7907134A (en) | 1979-09-25 | 1979-09-25 | TELEPHONE INSTALLATION OF THE TYPE INDICATED AS A STAR POINT INSTALLATION. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES8105913A1 true ES8105913A1 (en) | 1981-06-16 |
ES495348A0 ES495348A0 (en) | 1981-06-16 |
Family
ID=19833910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES495348A Granted ES495348A0 (en) | 1979-09-25 | 1980-09-25 | TELEPHONE SYSTEM FOR PRIVATE USE |
Country Status (10)
Country | Link |
---|---|
AU (1) | AU6265780A (en) |
DK (1) | DK403980A (en) |
ES (1) | ES495348A0 (en) |
FI (1) | FI802986A (en) |
FR (1) | FR2466161A1 (en) |
GB (1) | GB2060316A (en) |
IT (1) | IT1149255B (en) |
NL (1) | NL7907134A (en) |
NO (1) | NO802825L (en) |
SE (1) | SE8006662L (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3000858C2 (en) * | 1980-01-11 | 1986-11-13 | Neumann Elektronik GmbH, 4330 Mülheim | Button-controlled exchange, counter or loudspeaker system |
US4744103A (en) * | 1985-11-27 | 1988-05-10 | Rauland-Borg Corporation | Computer controlled multi-link communication system |
IN167984B (en) * | 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 (en) * | 1971-05-28 | 1973-05-25 | Supravox Sarl | |
GB1369829A (en) * | 1971-12-23 | 1974-10-09 | Standard Telephones Cables Ltd | Electric impulse transmitters |
FR2285775A1 (en) * | 1974-09-17 | 1976-04-16 | Berna Guy | Intercommunication system with selective calling - uses codes signals to alert slave stations branched from common line |
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/en not_active Application Discontinuation
-
1980
- 1980-09-22 FI FI802986A patent/FI802986A/en not_active Application Discontinuation
- 1980-09-23 GB GB8030653A patent/GB2060316A/en not_active Withdrawn
- 1980-09-24 IT IT24872/80A patent/IT1149255B/en active
- 1980-09-24 DK DK403980A patent/DK403980A/en unknown
- 1980-09-24 FR FR8020536A patent/FR2466161A1/en not_active Withdrawn
- 1980-09-24 SE SE8006662A patent/SE8006662L/en not_active Application Discontinuation
- 1980-09-24 AU AU62657/80A patent/AU6265780A/en not_active Abandoned
- 1980-09-24 NO NO802825A patent/NO802825L/en unknown
- 1980-09-25 ES ES495348A patent/ES495348A0/en active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2466161A1 (en) | 1981-03-27 |
NO802825L (en) | 1981-03-26 |
FI802986A (en) | 1981-03-26 |
SE8006662L (en) | 1981-03-26 |
ES495348A0 (en) | 1981-06-16 |
IT1149255B (en) | 1986-12-03 |
AU6265780A (en) | 1981-04-09 |
IT8024872A0 (en) | 1980-09-24 |
NL7907134A (en) | 1981-03-27 |
DK403980A (en) | 1981-03-26 |
GB2060316A (en) | 1981-04-29 |
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