DE171721C - - Google Patents
Info
- Publication number
- DE171721C DE171721C DENDAT171721D DE171721DA DE171721C DE 171721 C DE171721 C DE 171721C DE NDAT171721 D DENDAT171721 D DE NDAT171721D DE 171721D A DE171721D A DE 171721DA DE 171721 C DE171721 C DE 171721C
- Authority
- DE
- Germany
- Prior art keywords
- blocking
- short
- line
- circuit
- calling
- 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.)
- Active
Links
- 230000000903 blocking effect Effects 0.000 claims description 36
- 230000011664 signaling Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
- H04M1/70—Lock-out or secrecy arrangements in party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE171721C true DE171721C (cs) |
Family
ID=436666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT171721D Active DE171721C (cs) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE171721C (cs) |
-
0
- DE DENDAT171721D patent/DE171721C/de active Active
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