GB1478468A - Information transmission systems - Google Patents
Information transmission systemsInfo
- Publication number
- GB1478468A GB1478468A GB3878074A GB3878074A GB1478468A GB 1478468 A GB1478468 A GB 1478468A GB 3878074 A GB3878074 A GB 3878074A GB 3878074 A GB3878074 A GB 3878074A GB 1478468 A GB1478468 A GB 1478468A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- channel
- substitute
- control unit
- operating channel
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
1478468 Radio signalling SIEMENS AG 5 Sept 1974 [12 Sept 1973] 38780/74 Heading H4L In a system, particularly a radio relay link, wherein the transmission of an information signal via an operating channel can be switched over by a control unit to a substitute channel and vice versa when a pilot signal is faulty and/ or the signal to noise ratio is unsatisfactory, a further switching device under the control of the control unit makes the substitute channel available, when free, for an additional signal from which the pilot signal is omitted to enable the additional signal to be recognized, the control unit causing the further switching device to release the substitute channel to the first mentioned signal when conditions are such that the operating channel is required to switch over to the substitute channel. Preferably the control unit is arranged so that switching over of the operating channel to the substitute channel does not take place solely on the basis of the signal to noise level but occurs only when the pilot signal is absent. It is also preferably arranged that a switch back to transmission of the information signal to the operating channel from the substitute channel takes place immediately after the operating channel becomes serviceable again.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2346017A DE2346017C2 (en) | 1973-09-12 | 1973-09-12 | Control device for a switching device for the transmission of communication channels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1478468A true GB1478468A (en) | 1977-06-29 |
Family
ID=5892378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3878074A Expired GB1478468A (en) | 1973-09-12 | 1974-09-05 | Information transmission systems |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5078215A (en) |
| AT (1) | AT346390B (en) |
| BE (1) | BE819836A (en) |
| DE (1) | DE2346017C2 (en) |
| FR (1) | FR2243561B1 (en) |
| GB (1) | GB1478468A (en) |
| IN (1) | IN140605B (en) |
| IT (1) | IT1021308B (en) |
| NL (1) | NL7412141A (en) |
| SE (1) | SE392013B (en) |
-
1973
- 1973-09-12 DE DE2346017A patent/DE2346017C2/en not_active Expired
-
1974
- 1974-09-05 GB GB3878074A patent/GB1478468A/en not_active Expired
- 1974-09-09 FR FR7430438A patent/FR2243561B1/fr not_active Expired
- 1974-09-12 AT AT737174A patent/AT346390B/en not_active IP Right Cessation
- 1974-09-12 IT IT27205/74A patent/IT1021308B/en active
- 1974-09-12 BE BE148455A patent/BE819836A/en unknown
- 1974-09-12 NL NL7412141A patent/NL7412141A/en not_active Application Discontinuation
- 1974-09-12 JP JP49105466A patent/JPS5078215A/ja active Pending
- 1974-09-12 SE SE7411512A patent/SE392013B/en unknown
- 1974-11-28 IN IN2649/CAL/1974A patent/IN140605B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2346017B1 (en) | 1975-03-13 |
| FR2243561B1 (en) | 1977-03-25 |
| SE392013B (en) | 1977-03-07 |
| DE2346017C2 (en) | 1975-10-09 |
| NL7412141A (en) | 1975-03-14 |
| BE819836A (en) | 1975-03-12 |
| FR2243561A1 (en) | 1975-04-04 |
| AU7315874A (en) | 1976-03-18 |
| IN140605B (en) | 1976-12-11 |
| IT1021308B (en) | 1978-01-30 |
| AT346390B (en) | 1978-11-10 |
| SE7411512L (en) | 1975-03-13 |
| ATA737174A (en) | 1978-03-15 |
| JPS5078215A (en) | 1975-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |