GB1505228A - Methods of data transmission - Google Patents

Methods of data transmission

Info

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
Application number
GB3964276A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1505228A publication Critical patent/GB1505228A/en
Expired legal-status Critical Current

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

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).
GB3964276A 1975-09-25 1976-09-24 Methods of data transmission Expired GB1505228A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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