GB1505228A - Methods of data transmission - Google Patents
Methods of data transmissionInfo
- Publication number
- GB1505228A GB1505228A GB3964276A GB3964276A GB1505228A GB 1505228 A GB1505228 A GB 1505228A GB 3964276 A GB3964276 A GB 3964276A GB 3964276 A GB3964276 A GB 3964276A GB 1505228 A GB1505228 A GB 1505228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- block
- call
- transmitted
- transmission
- station
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Small-Scale Networks (AREA)
Abstract
1505228 Data transmission SIEMENS AG 24 Sept 1976 [25 Sept 1975] 39642/76 Heading H4P In the transmission of data characters or blocks B1, B2, B3 ... from station ST1 to station ST2 in response to call-up characters or bits Z1, Z1 transmitted from station ST2 to station ST1, the call-up indicia Z1, Z1 alternating regularly between the direct and inverted form in fault free operation, one block being transmitted for each call-up received, station ST1 is so arranged that each block is transmitted directly in response to call-up Z 1, and in inverted form in response to call up Zl. Should a block as received at ST2 be detected as disturbed; each block including a parity bit; the last transmitted call-up is re-transmitted, to cause the repetition of transmission of the last transmitted data block. To be detected as disturbance free, a received block must have the same inversion state as the last transmitted call-up. A fault signal F generated at receipt of a disturbed block prevents onward transmission of the block as data N2. This transmission scheme is shown to be immune to the type of fault wherein a call-up transmitted from ST2 is disturbed in transmission at St, to invert its logic state. The scheme is compared with a disadvantageous known system in which the blocks are always transmitted in direct form, Fig. 1 (not shown), wherein the disturbance in the call-up at St results in either repetition of a block (B2) in the forward data (N2), or the entire omission of a block (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752542846 DE2542846C3 (en) | 1975-09-25 | 1975-09-25 | Method for data transmission between two stations in duplex or half-duplex operation with automatic error correction by querying and repeating the characters received with interference |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1505228A true GB1505228A (en) | 1978-03-30 |
Family
ID=5957434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3964276A Expired GB1505228A (en) | 1975-09-25 | 1976-09-24 | Methods of data transmission |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2542846C3 (en) |
GB (1) | GB1505228A (en) |
NL (1) | NL7610376A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0854592A2 (en) * | 1997-01-21 | 1998-07-22 | ICO Services Ltd. | Digital messaging method and apparatus for spread spectrum communications under extremes of digital messages readability |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2747454C1 (en) * | 1977-10-24 | 1992-09-24 | Siemens Ag | Message transfer system with frequency hopping |
CA1249886A (en) * | 1986-05-02 | 1989-02-07 | Claude J. Champagne | Method of duplex data transmission using a send-and- wait protocol |
-
1975
- 1975-09-25 DE DE19752542846 patent/DE2542846C3/en not_active Expired
-
1976
- 1976-09-17 NL NL7610376A patent/NL7610376A/en not_active Application Discontinuation
- 1976-09-24 GB GB3964276A patent/GB1505228A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0854592A2 (en) * | 1997-01-21 | 1998-07-22 | ICO Services Ltd. | Digital messaging method and apparatus for spread spectrum communications under extremes of digital messages readability |
EP0854592A3 (en) * | 1997-01-21 | 1999-08-04 | ICO Services Ltd. | Digital messaging method and apparatus for spread spectrum communications under extremes of digital messages readability |
US6230298B1 (en) | 1997-01-21 | 2001-05-08 | Ico Services Ltd | Digital messaging method and apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE2542846A1 (en) | 1977-04-07 |
NL7610376A (en) | 1977-03-29 |
DE2542846B2 (en) | 1977-09-08 |
DE2542846C3 (en) | 1978-05-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |