GB1522663A - Data modems with automatic equalization drop-out detection and data echo protection - Google Patents

Data modems with automatic equalization drop-out detection and data echo protection

Info

Publication number
GB1522663A
GB1522663A GB2919275A GB2919275A GB1522663A GB 1522663 A GB1522663 A GB 1522663A GB 2919275 A GB2919275 A GB 2919275A GB 2919275 A GB2919275 A GB 2919275A GB 1522663 A GB1522663 A GB 1522663A
Authority
GB
United Kingdom
Prior art keywords
data
modem
tone signal
out detection
appearance
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
GB2919275A
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.)
Milgo Electronic Corp
Original Assignee
Milgo Electronic Corp
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 Milgo Electronic Corp filed Critical Milgo Electronic Corp
Priority to GB2919275A priority Critical patent/GB1522663A/en
Priority to DE19752532414 priority patent/DE2532414A1/en
Priority to CA232,189A priority patent/CA1038977A/en
Priority to FR7524307A priority patent/FR2320668A1/en
Priority to SE7509044A priority patent/SE399165B/en
Publication of GB1522663A publication Critical patent/GB1522663A/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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
    • H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03656—Initialisation
    • H04L2025/03662—Initialisation to a fixed value

Abstract

1522663 Data communication systems MILGO ELECTRONIC CORP 11 July 1975 29192/75 Heading H4P A data communication system comprises a first modem A arranged for transmitting data messages from a first data terminal A through a transmission line and a second modem B to a second data terminal B, modem A comprising means arranged to transmit to modem B, immediately before each data message, a sequence of pre-message control signals of which one is a tone signal of predetermined frequency (see Figs. 3-4), and modem B comprising means for detecting the appearance of signals from the line to activate a sampling and testing circuit which when activated samples the last said signals during a predetermined interval of time, testing for the appearance of the tone signal therein, and providing a first or a second output signal when the tone signal is present or absent respectively. The second output signal indicates that a data dropout has occurred. The system is described in detail w.r.t. Figs. 2,5-12 (not shown).
GB2919275A 1975-07-11 1975-07-11 Data modems with automatic equalization drop-out detection and data echo protection Expired GB1522663A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB2919275A GB1522663A (en) 1975-07-11 1975-07-11 Data modems with automatic equalization drop-out detection and data echo protection
DE19752532414 DE2532414A1 (en) 1975-07-11 1975-07-19 DATA MODEM WITH AUTOMATIC ADJUSTMENT, SIGNAL FAILURE DETECTION AND ECHO PROTECTION
CA232,189A CA1038977A (en) 1975-07-11 1975-07-24 Data modems with automatic equalization, drop-out detection and data echo protection
FR7524307A FR2320668A1 (en) 1975-07-11 1975-08-04 DATA TRANSMISSION DEVICE
SE7509044A SE399165B (en) 1975-07-11 1975-08-12 DATA COMMUNICATION SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2919275A GB1522663A (en) 1975-07-11 1975-07-11 Data modems with automatic equalization drop-out detection and data echo protection

Publications (1)

Publication Number Publication Date
GB1522663A true GB1522663A (en) 1978-08-23

Family

ID=10287623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2919275A Expired GB1522663A (en) 1975-07-11 1975-07-11 Data modems with automatic equalization drop-out detection and data echo protection

Country Status (5)

Country Link
CA (1) CA1038977A (en)
DE (1) DE2532414A1 (en)
FR (1) FR2320668A1 (en)
GB (1) GB1522663A (en)
SE (1) SE399165B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2920575C2 (en) * 1979-05-21 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Digital telecommunications system with at least one four-wire line section
JP2682703B2 (en) * 1989-07-21 1997-11-26 富士通株式会社 Multipoint connection modem retraining method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3550005A (en) * 1968-03-01 1970-12-22 Milgo Electronic Corp Equalization circuit
US3566271A (en) * 1969-02-18 1971-02-23 Int Communications Corp Automatic equilization for multiple polled stations
US3644830A (en) * 1969-11-18 1972-02-22 Milgo Electronic Corp Data modem having phase frequency and amplitude distortion compensating means
US3742360A (en) * 1969-11-18 1973-06-26 Milgo Electronic Corp Automatic equalizer circuit
US3760277A (en) * 1971-05-17 1973-09-18 Milgo Electronic Corp Coding and decoding system with multi-level format

Also Published As

Publication number Publication date
SE7509044L (en) 1977-02-13
SE399165B (en) 1978-01-30
DE2532414A1 (en) 1977-02-10
FR2320668B1 (en) 1982-11-12
CA1038977A (en) 1978-09-19
FR2320668A1 (en) 1977-03-04

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19950710