GB1473898A - Data transmission systems - Google Patents

Data transmission systems

Info

Publication number
GB1473898A
GB1473898A GB3184374A GB3184374A GB1473898A GB 1473898 A GB1473898 A GB 1473898A GB 3184374 A GB3184374 A GB 3184374A GB 3184374 A GB3184374 A GB 3184374A GB 1473898 A GB1473898 A GB 1473898A
Authority
GB
United Kingdom
Prior art keywords
data
terminal
conveying
fsn
block
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
GB3184374A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3184374A priority Critical patent/GB1473898A/en
Publication of GB1473898A publication Critical patent/GB1473898A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

1473898 Data transmission STANDARD TELEPHONES & CABLES Ltd 8 July 1975 [18 July 1974] 31843/74 Heading H4P In a data transmission system of the duplex operation type in which a retransmission cycle is effected on receipt of a corrupted block of data, each data-conveying block is allocated a forward sequence number (FSN), the numbers (FSN) being allocated successively in a fixed cyclic sequence so that each data-conveying block transmitted from one terminal to another has a different FSN from the immediately preceding data-conveying block. Idle blocks are transmitted in the absence of data-conveying blocks and each block whether data-conveying or idle, includes a revertive sequence number (RSN) which identifies the next data-conveying block to be received by said one terminal from that other terminal. Each terminal includes store and logic circuitry described with reference to the single Figure (not shown) which recognizes the said numbers FSN and RSN, which detects by parity checking the reception of a corrupted form of a data-conveying block transmitted from another terminal and which ensures that retransmission occurs only in the direction of said terminal to said other terminal.
GB3184374A 1975-07-08 1975-07-08 Data transmission systems Expired GB1473898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3184374A GB1473898A (en) 1975-07-08 1975-07-08 Data transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3184374A GB1473898A (en) 1975-07-08 1975-07-08 Data transmission systems

Publications (1)

Publication Number Publication Date
GB1473898A true GB1473898A (en) 1977-05-18

Family

ID=10329225

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3184374A Expired GB1473898A (en) 1975-07-08 1975-07-08 Data transmission systems

Country Status (1)

Country Link
GB (1) GB1473898A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170346709A1 (en) * 2016-05-31 2017-11-30 128 Technology, Inc. Link Status Monitoring Based on Packet Loss Detection
US10091099B2 (en) 2016-05-31 2018-10-02 128 Technology, Inc. Session continuity in the presence of network address translation
US10257061B2 (en) 2016-05-31 2019-04-09 128 Technology, Inc. Detecting source network address translation in a communication system
US10841206B2 (en) 2016-05-31 2020-11-17 128 Technology, Inc. Flow modification including shared context
US11075836B2 (en) 2016-05-31 2021-07-27 128 Technology, Inc. Reverse forwarding information base enforcement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170346709A1 (en) * 2016-05-31 2017-11-30 128 Technology, Inc. Link Status Monitoring Based on Packet Loss Detection
US10091099B2 (en) 2016-05-31 2018-10-02 128 Technology, Inc. Session continuity in the presence of network address translation
US10200264B2 (en) * 2016-05-31 2019-02-05 128 Technology, Inc. Link status monitoring based on packet loss detection
US10257061B2 (en) 2016-05-31 2019-04-09 128 Technology, Inc. Detecting source network address translation in a communication system
US10841206B2 (en) 2016-05-31 2020-11-17 128 Technology, Inc. Flow modification including shared context
US11075836B2 (en) 2016-05-31 2021-07-27 128 Technology, Inc. Reverse forwarding information base enforcement
US11722405B2 (en) 2016-05-31 2023-08-08 128 Technology, Inc. Reverse forwarding information base enforcement

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee