FR1339207A - Receiving devices for direct current signals - Google Patents

Receiving devices for direct current signals

Info

Publication number
FR1339207A
FR1339207A FR915337A FR915337A FR1339207A FR 1339207 A FR1339207 A FR 1339207A FR 915337 A FR915337 A FR 915337A FR 915337 A FR915337 A FR 915337A FR 1339207 A FR1339207 A FR 1339207A
Authority
FR
France
Prior art keywords
direct current
receiving devices
current signals
signals
devices
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
FR915337A
Other languages
French (fr)
Inventor
Guenter Lehmann
Guenther Helfrich
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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
Priority claimed from DEST18554A external-priority patent/DE1146138B/en
Priority claimed from DEST18913A external-priority patent/DE1160902B/en
Priority claimed from DEST19370A external-priority patent/DE1161327B/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of FR1339207A publication Critical patent/FR1339207A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR915337A 1961-11-14 1962-11-14 Receiving devices for direct current signals Expired FR1339207A (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DEST18554A DE1146138B (en) 1961-11-14 1961-11-14 Circuit arrangement for the reception of DC code characters in telecommunications, in particular telephone switching systems
DEST18913A DE1160902B (en) 1962-03-01 1962-03-01 Asymmetrical direct current signal process, especially for touch dialing in telephone systems
DEST19370A DE1161327B (en) 1962-03-01 1962-06-16 Asymmetrical direct current push-button selection process and circuit arrangement for its implementation
DEST20241A DE1173544B (en) 1962-03-01 1963-01-31 Asymmetrical direct current signal method over two-wire telecommunication lines, especially telephone lines
DEST22144A DE1217460B (en) 1962-03-01 1964-05-21 Asymmetrical direct current push-button selection process for telecommunications, especially telephone systems
DEST24001A DE1293873B (en) 1962-03-01 1965-06-19 Circuit arrangement for evaluating the loop status and for differentiating between loop resistances of a telecommunication line, in particular a telephone line
DEST24536A DE1278551B (en) 1962-03-01 1965-10-20 Circuit arrangement for monitoring the loop resistance of a telecommunication line, in particular a telephone line
DEST24545A DE1301841B (en) 1962-03-01 1965-10-22 Circuit arrangement for evaluating the loop status and for differentiating between loop resistances of a telecommunication line, in particular a telephone line
DEST25275A DE1301373B (en) 1962-03-01 1966-04-23 Circuit arrangement for evaluating the loop status and for differentiating between loop resistances of a telecommunication line, in particular a telephone line

Publications (1)

Publication Number Publication Date
FR1339207A true FR1339207A (en) 1963-10-04

Family

ID=27570739

Family Applications (1)

Application Number Title Priority Date Filing Date
FR915337A Expired FR1339207A (en) 1961-11-14 1962-11-14 Receiving devices for direct current signals

Country Status (1)

Country Link
FR (1) FR1339207A (en)

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