IE801013L - Circuit for telephones - Google Patents
Circuit for telephonesInfo
- Publication number
- IE801013L IE801013L IE801013A IE101380A IE801013L IE 801013 L IE801013 L IE 801013L IE 801013 A IE801013 A IE 801013A IE 101380 A IE101380 A IE 101380A IE 801013 L IE801013 L IE 801013L
- Authority
- IE
- Ireland
- Prior art keywords
- telephone instrument
- line
- pcm
- leading
- extension line
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/066—Telephone sets adapted for data transmision
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
1. Circuitry for telephone instruments connected to PCM- extension lines in which digital speech information transmitted via a duplex two-wire PCM-line with feeding facilities leading to a PCM-exchange is transformed into analogous values when incoming and is transformed out of analogous values when outgoing by equipment arranged inside a codec (CD) and in which control units (S) receive and compute signalling information, comprising that besides the control units (S) being inside the telephone instrument and provided for computing signalling information incoming and outgoing via the extension line (a/b), there is provided a coupling unit (KE) also being contained in the telephone instrument for switching through speech and tone signals, which selectively enables connections between the codec (CD) inside the same telephone instrument or an information sending unit (IS) or an information receiving unit (IE) and the only extension line (a/b) leading to an exchange or to a connection line (a'/b') leading to a further telephone instrument as well as connections between the extension line (a/b) and the connection line (a'/b'), whereby this coupling unit (KE) is controlled by an operation-status-control (BS) corresponding to commands coming from the extension line (a/b) or the connection line (a'/b') or coming from the operation elements, for example keys (T), hook switches (GU) of the telephone instrument.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2919618A DE2919618C2 (en) | 1979-05-16 | 1979-05-16 | Circuit arrangement for telephone sets connected to PCM connection lines |
Publications (2)
Publication Number | Publication Date |
---|---|
IE801013L true IE801013L (en) | 1980-11-16 |
IE50423B1 IE50423B1 (en) | 1986-04-16 |
Family
ID=6070793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1013/80A IE50423B1 (en) | 1979-05-16 | 1980-05-15 | Circuit arrangement for telephone instruments connected via pcm-subscriber lines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0019250B1 (en) |
AT (1) | ATE1925T1 (en) |
DE (1) | DE2919618C2 (en) |
IE (1) | IE50423B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2518857A1 (en) * | 1981-12-18 | 1983-06-24 | Thomson Csf Mat Tel | TELEMATIC TERMINAL CONNECTED TO TWO TELEPHONE LINES AND PARTIALLY REMOTE POWERED |
US5042028A (en) * | 1988-08-31 | 1991-08-20 | Kabushiki Kaisha Toshiba | Communication terminal device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1171020B (en) * | 1962-11-15 | 1964-05-27 | Telefonbau | Circuit arrangement for boss-secretary stations in telephone extension systems |
DE2421002C3 (en) * | 1974-04-30 | 1980-07-03 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Messaging system |
GB1540900A (en) * | 1975-06-30 | 1979-02-21 | Ericsson L M Pty Ltd | Digital testing and power control in a digital communication system |
GB1521127A (en) * | 1975-10-02 | 1978-08-16 | Standard Telephones Cables Ltd | Telecommunication systems |
DE2619391C3 (en) * | 1976-04-30 | 1978-11-30 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Message system with multiple access and decentralized switching |
DE2621603C3 (en) * | 1976-05-14 | 1978-11-16 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method and circuit arrangement for the independent transmission of PCM message words and signaling words between a subscriber station and an exchange |
DE2643703A1 (en) * | 1976-09-28 | 1978-03-30 | Siemens Ag | PCM TDM telephone network - has two=wire multiplexed line operated in four-wire mode and with memories and CODEC |
US4122308A (en) * | 1977-06-03 | 1978-10-24 | Utility Verification Corp. | Telephone call metering device |
DE2729689B1 (en) * | 1977-06-30 | 1978-12-07 | Siemens Ag | Communication system |
-
1979
- 1979-05-16 DE DE2919618A patent/DE2919618C2/en not_active Expired
-
1980
- 1980-05-10 AT AT80102605T patent/ATE1925T1/en active
- 1980-05-10 EP EP80102605A patent/EP0019250B1/en not_active Expired
- 1980-05-15 IE IE1013/80A patent/IE50423B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
ATE1925T1 (en) | 1982-12-15 |
EP0019250B1 (en) | 1982-12-01 |
DE2919618C2 (en) | 1981-06-19 |
DE2919618B1 (en) | 1980-08-21 |
IE50423B1 (en) | 1986-04-16 |
EP0019250A1 (en) | 1980-11-26 |
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