GB1445800A - Data transmission network - Google Patents
Data transmission networkInfo
- Publication number
- GB1445800A GB1445800A GB1833574A GB1833574A GB1445800A GB 1445800 A GB1445800 A GB 1445800A GB 1833574 A GB1833574 A GB 1833574A GB 1833574 A GB1833574 A GB 1833574A GB 1445800 A GB1445800 A GB 1445800A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- exchange
- tron
- calling
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
1445800 Automatic exchange systems COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 26 April 1974 [8 May 1973] 18335/74 Heading H4K In an exchange system in which high bitrate data or speech may be transmitted between subscribers via an exchange CC2 along a twowire line L1, L2 and a call is set up by D.C. signalling, this signalling is carried out by signalling devices, each including two auxiliary wires RON and TRON, which are provided at the subscriber's equipment and the subscriber's exchange line circuit respectively and which enable D.C. to be removed from the line once a call has been set up. Both calling and called subscriber have the RON and TRON wires at their respective equipments and at their respective line circuits, and these latter two pairs of wires are switched through the exchange, along with the two-wire line L1, L2 in the conventional manner. The sequence of operations for setting-up a call, AB2 being the called party, once switchthrough has been completed, is as follows: (a) The calling party, via the signalling device at his equipment, applies a positive potential to the exchange TRON wire which energizes relay I directly, and relay R via the line L1, L2 and transformer circuit T2. Contact r thereby closes to provide a calling signal. (b) The called party acknowledges by depressing key E. Relay PR is energized, resulting in the energization of feed relay A at the line circuit. Thus contact α closes and sends a "connection made" signal to the calling party. (c) The calling party cancels the positive potential at TRON exchange, causing r to open and the calling signal to cease. (d) The called party releases the key E which causes the release of PR and consequently A, thereby removing D.C. from the line.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7316586A FR2229178B1 (en) | 1973-05-08 | 1973-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1445800A true GB1445800A (en) | 1976-08-11 |
Family
ID=9118979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1833574A Expired GB1445800A (en) | 1973-05-08 | 1974-04-26 | Data transmission network |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE814455A (en) |
CH (1) | CH581935A5 (en) |
DE (1) | DE2420992A1 (en) |
FR (1) | FR2229178B1 (en) |
GB (1) | GB1445800A (en) |
IT (1) | IT1012163B (en) |
NL (1) | NL7406015A (en) |
-
1973
- 1973-05-08 FR FR7316586A patent/FR2229178B1/fr not_active Expired
-
1974
- 1974-04-22 CH CH552574A patent/CH581935A5/xx not_active IP Right Cessation
- 1974-04-26 GB GB1833574A patent/GB1445800A/en not_active Expired
- 1974-04-30 DE DE19742420992 patent/DE2420992A1/en not_active Withdrawn
- 1974-05-02 BE BE1005924A patent/BE814455A/en unknown
- 1974-05-03 NL NL7406015A patent/NL7406015A/xx active Search and Examination
- 1974-05-08 IT IT2244274A patent/IT1012163B/en active
Also Published As
Publication number | Publication date |
---|---|
FR2229178B1 (en) | 1978-12-29 |
IT1012163B (en) | 1977-03-10 |
DE2420992A1 (en) | 1974-11-28 |
BE814455A (en) | 1974-11-04 |
CH581935A5 (en) | 1976-11-15 |
FR2229178A1 (en) | 1974-12-06 |
NL7406015A (en) | 1974-11-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |