BE371832A - - Google Patents
Info
- Publication number
- BE371832A BE371832A BE371832DA BE371832A BE 371832 A BE371832 A BE 371832A BE 371832D A BE371832D A BE 371832DA BE 371832 A BE371832 A BE 371832A
- Authority
- BE
- Belgium
- Prior art keywords
- line
- relay
- telephone system
- circuit
- office
- Prior art date
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
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE371832A true BE371832A (mo) |
Family
ID=43049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE371832D BE371832A (mo) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE371832A (mo) |
-
0
- BE BE371832D patent/BE371832A/fr unknown
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