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
Application number
DENDAT238451D
Other languages
German (de)
English (en)
Publication of DE238451C publication Critical patent/DE238451C/de
Active legal-status Critical Current

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)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
DENDAT238451D Active DE238451C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE238451T

Publications (1)

Publication Number Publication Date
DE238451C true DE238451C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family

ID=5903544

Family Applications (2)

Application Number Title Priority Date Filing Date
DENDAT238451D Active DE238451C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DENDAT224290D Active DE224290C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family Applications After (1)

Application Number Title Priority Date Filing Date
DENDAT224290D Active DE224290C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Country Status (1)

Country Link
DE (2) DE224290C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
DE224290C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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