GB1388039A - Telecommunication systems - Google Patents
Telecommunication systemsInfo
- Publication number
- GB1388039A GB1388039A GB2327372A GB2327372A GB1388039A GB 1388039 A GB1388039 A GB 1388039A GB 2327372 A GB2327372 A GB 2327372A GB 2327372 A GB2327372 A GB 2327372A GB 1388039 A GB1388039 A GB 1388039A
- Authority
- GB
- United Kingdom
- Prior art keywords
- subscriber
- connection
- centre
- tone
- wide band
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
1388039 Automatic exchange system TELEFONAKTIEBOLAGET L M ERICSSON 17 May 1972 [18 May 1971] 23273/72 Heading H4K In a telecommunication system two subscribers who are already engaged in an audio connection can both send a special service request to a connection centre which on reception of both requests causes the establishment of a special connection path between the subscribers. Two systems in which some subscribers have video or data equipment are described. In one embodiment (Fig. 1, not shown) the connection centre is a registering and signalling only centre, each substation with wide band equipment being coupled to a common wide band transmission line via a channel selecting circuit (Fig. 2, not shown) arranged to respond to tones from the centre. In a second embodiment (Figs. 3 and 4, not shown) the connection centre is a wide band switching arrangement capable of interconnecting wide band subscriber lines and trunks. During a call in either embodiment either subscriber can initiate a video connection request by depressing either a transmit or a receive button at his substation. Depression of a button loops a wide band line pair to the associated connection centre which identifies the subscriber and test to see if there is a first tone on the line pair. As there is not metering is initiated and the time pair is coupled to a generator for the tone which is transmitted over the line pair to the substation, then over the audio connection to the other subscriber. If that subscriber responds by depressing his receive or transmit button as appropriate looping the line pair to the associated connection centre, the latter makes a second response identifying that subscriber and testing the line for the presence of the tone. As the tone is present the centre responds and scans the appropriate video links for a free channel. When a free channel is found a tone characteristic of the channel is transmitted to aud registered in (in the case of the first embodiment) the two subscriber channel selecting circuits or (in the case of the second embodiment) the connection centre equipment which responded to the first subscriber to initiate a video connection request. The required connection is established and retained until one or other subscriber depresses a release key. The direction of video transmission can be reversed during the call by both subscribers depressing the appropriate buttons.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE641271A SE352798B (en) | 1971-05-18 | 1971-05-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1388039A true GB1388039A (en) | 1975-03-19 |
Family
ID=20268607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2327372A Expired GB1388039A (en) | 1971-05-18 | 1972-05-17 | Telecommunication systems |
Country Status (12)
Country | Link |
---|---|
JP (1) | JPS5529631B1 (en) |
AU (1) | AU465426B2 (en) |
CA (1) | CA944090A (en) |
DE (1) | DE2223539C3 (en) |
DK (1) | DK142479C (en) |
ES (1) | ES402811A1 (en) |
FI (1) | FI56294C (en) |
FR (1) | FR2138023B1 (en) |
GB (1) | GB1388039A (en) |
IT (1) | IT955625B (en) |
NO (1) | NO129824B (en) |
SE (1) | SE352798B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2841328C2 (en) * | 1978-09-20 | 1983-09-29 | Siemens AG, 1000 Berlin und 8000 München | Special telephone system with telephoto control device |
BR9002488A (en) * | 1990-04-04 | 1991-11-12 | Mentel Mensagens Telefonicos E | AUTOMATIC SYSTEM FOR REPRODUCTION OF RECORDED MESSAGE IN VOICE ON TELEPHONE LINE |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1512938B2 (en) * | 1967-04-28 | 1970-11-12 | Siemens AG, 1000 Berlin u. 8000 München | Circuit arrangement for telephone systems, in particular telephone branch exchange systems with central control, for connecting connection points provided with television equipment |
DE1964257B2 (en) * | 1969-12-22 | 1976-11-18 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD AND ARRANGEMENT FOR ESTABLISHING A CONNECTION PATH FOR VIDEO SIGNALS |
-
1971
- 1971-05-18 SE SE641271A patent/SE352798B/xx unknown
-
1972
- 1972-05-02 CA CA141,090A patent/CA944090A/en not_active Expired
- 1972-05-05 FI FI127772A patent/FI56294C/en active
- 1972-05-05 AU AU41943/72A patent/AU465426B2/en not_active Expired
- 1972-05-15 DE DE19722223539 patent/DE2223539C3/en not_active Expired
- 1972-05-16 NO NO175172A patent/NO129824B/no unknown
- 1972-05-17 GB GB2327372A patent/GB1388039A/en not_active Expired
- 1972-05-17 FR FR7217631A patent/FR2138023B1/fr not_active Expired
- 1972-05-17 DK DK246672A patent/DK142479C/en active
- 1972-05-17 ES ES402811A patent/ES402811A1/en not_active Expired
- 1972-05-18 JP JP4951272A patent/JPS5529631B1/ja active Pending
- 1972-05-18 IT IT2451772A patent/IT955625B/en active
Also Published As
Publication number | Publication date |
---|---|
CA944090A (en) | 1974-03-19 |
FI56294C (en) | 1979-12-10 |
ES402811A1 (en) | 1975-04-01 |
SE352798B (en) | 1973-01-08 |
DK142479B (en) | 1980-11-03 |
DE2223539B2 (en) | 1974-09-05 |
AU465426B2 (en) | 1975-09-25 |
NO129824B (en) | 1974-05-27 |
IT955625B (en) | 1973-09-29 |
AU4194372A (en) | 1973-11-08 |
DE2223539C3 (en) | 1978-04-13 |
DE2223539A1 (en) | 1972-11-30 |
FI56294B (en) | 1979-08-31 |
FR2138023A1 (en) | 1972-12-29 |
DK142479C (en) | 1981-03-16 |
JPS5529631B1 (en) | 1980-08-05 |
FR2138023B1 (en) | 1973-07-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |