DE238451C - - Google Patents
Info
- Publication number
- DE238451C DE238451C DENDAT238451D DE238451DA DE238451C DE 238451 C DE238451 C DE 238451C DE NDAT238451 D DENDAT238451 D DE NDAT238451D DE 238451D A DE238451D A DE 238451DA DE 238451 C DE238451 C DE 238451C
- Authority
- DE
- Germany
- Prior art keywords
- line
- circuit
- busy
- switch
- test signal
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE238451T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE238451C true DE238451C (https=) |
Family
ID=5903544
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT224290D Active DE224290C (https=) | |||
| DENDAT238451D Active DE238451C (https=) |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT224290D Active DE224290C (https=) |
Country Status (1)
| Country | Link |
|---|---|
| DE (2) | DE238451C (https=) |
-
0
- DE DENDAT224290D patent/DE224290C/de active Active
- DE DENDAT238451D patent/DE238451C/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE224290C (https=) |
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