GB1218145A - Improvements in or relating to data transmission systems - Google Patents

Improvements in or relating to data transmission systems

Info

Publication number
GB1218145A
GB1218145A GB1635369A GB1635369A GB1218145A GB 1218145 A GB1218145 A GB 1218145A GB 1635369 A GB1635369 A GB 1635369A GB 1635369 A GB1635369 A GB 1635369A GB 1218145 A GB1218145 A GB 1218145A
Authority
GB
United Kingdom
Prior art keywords
block
receiver
switching signal
march
transmission systems
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
GB1635369A
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 GB1218145A publication Critical patent/GB1218145A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • 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

Landscapes

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

Abstract

1,218,145. Digital transmission systems; automatic gain control. SIEMENS A.G. 28 March, 1969 [29 March, 1968], No. 16353/69. Headings H4P and H4R. In a block data transmission system in which errors are corrected by requesting retransmission of faulty blocks, a switching signal is sent over a supervisory channel prior to the transmission of each block to switch the receiver terminal to the receiving state. When the transmitter terminal transmits a block via a control unit to the data channel it is preceded by a tag signal (e.g. continuous stop) on the data channel and a switching signal on the supervisory channel. The control unit at the receiver switches in the receiver terminal on detection of the switching signal. The tag signal has sufficient duration that it is present when switching has been accomplished and can then adjust the receiver a.g.c. The receiver terminal is switched out at the end of each block and the a.g.c. is clamped at its current level.
GB1635369A 1968-03-29 1969-03-28 Improvements in or relating to data transmission systems Expired GB1218145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP1762051.8-3A DE1300960B (en) 1968-03-29 1968-03-29 Method for transferring data with block protection

Publications (1)

Publication Number Publication Date
GB1218145A true GB1218145A (en) 1971-01-06

Family

ID=5696839

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1635369A Expired GB1218145A (en) 1968-03-29 1969-03-28 Improvements in or relating to data transmission systems

Country Status (7)

Country Link
BE (1) BE734555A (en)
CH (1) CH481536A (en)
DE (1) DE1300960B (en)
GB (1) GB1218145A (en)
LU (1) LU58767A1 (en)
NL (1) NL6904875A (en)
SE (1) SE358064B (en)

Also Published As

Publication number Publication date
LU58767A1 (en) 1969-10-28
DE1300960B (en) 1969-08-14
SE358064B (en) 1973-07-16
NL6904875A (en) 1969-10-01
CH481536A (en) 1969-11-15
BE734555A (en) 1969-12-15

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