FR87937E - Receiving devices for direct current signals - Google Patents
Receiving devices for direct current signalsInfo
- Publication number
- FR87937E FR87937E FR17934A FR17934A FR87937E FR 87937 E FR87937 E FR 87937E FR 17934 A FR17934 A FR 17934A FR 17934 A FR17934 A FR 17934A FR 87937 E FR87937 E FR 87937E
- 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
Links
Classifications
-
- 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
-
- 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
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR17934A FR87937E (en) | 1961-11-14 | 1965-05-21 | Receiving devices for direct current signals |
Applications Claiming Priority (10)
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 |
FR17934A FR87937E (en) | 1961-11-14 | 1965-05-21 | Receiving devices for direct current signals |
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 |
---|---|
FR87937E true FR87937E (en) | 1966-11-04 |
Family
ID=48851557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR17934A Expired FR87937E (en) | 1961-11-14 | 1965-05-21 | Receiving devices for direct current signals |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR87937E (en) |
-
1965
- 1965-05-21 FR FR17934A patent/FR87937E/en not_active Expired
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