FR92180E - Receiving devices for direct current signals - Google Patents
Receiving devices for direct current signalsInfo
- Publication number
- FR92180E FR92180E FR103659A FR103659A FR92180E FR 92180 E FR92180 E FR 92180E FR 103659 A FR103659 A FR 103659A FR 103659 A FR103659 A FR 103659A FR 92180 E FR92180 E FR 92180E
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR103659A FR92180E (en) | 1962-03-01 | 1967-04-21 | Receiving devices for direct current signals |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST18913A DE1160902B (en) | 1962-03-01 | 1962-03-01 | Asymmetrical direct current signal process, especially for touch dialing in telephone systems |
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 |
FR103659A FR92180E (en) | 1962-03-01 | 1967-04-21 | Receiving devices for direct current signals |
Publications (1)
Publication Number | Publication Date |
---|---|
FR92180E true FR92180E (en) | 1968-10-04 |
Family
ID=27570738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR103659A Expired FR92180E (en) | 1962-03-01 | 1967-04-21 | Receiving devices for direct current signals |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR92180E (en) |
-
1967
- 1967-04-21 FR FR103659A patent/FR92180E/en not_active Expired
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