Classifications

• • 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
  • H04M1/30—Devices which can set up and transmit only one digit at a time
  • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
  • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/71—Substation extension arrangements
  • H04M1/715—Substation extension arrangements using two or more extensions per line
• • 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
  • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
  • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Telephonic Communication Services (AREA)
• Interconnected Communication Systems, Intercoms, And Interphones (AREA)
• Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
• Monitoring And Testing Of Transmission In General (AREA)
• Monitoring And Testing Of Exchanges (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19833910

Family Applications (1)

Country Status (10)

Families Citing this family (4)

Family Cites Families (4)

• 1979
  • 1979-09-25 NL NL7907134A patent/NL7907134A/nl not_active Application Discontinuation
• 1980
  • 1980-09-22 FI FI802986A patent/FI802986A/fi not_active Application Discontinuation
  • 1980-09-23 GB GB8030653A patent/GB2060316A/en not_active Withdrawn
  • 1980-09-24 DK DK403980A patent/DK403980A/da unknown
  • 1980-09-24 AU AU62657/80A patent/AU6265780A/en not_active Abandoned
  • 1980-09-24 NO NO802825A patent/NO802825L/no unknown
  • 1980-09-24 IT IT24872/80A patent/IT1149255B/it active
  • 1980-09-24 FR FR8020536A patent/FR2466161A1/fr not_active Withdrawn
  • 1980-09-24 SE SE8006662A patent/SE8006662L/ not_active Application Discontinuation
  • 1980-09-25 ES ES495348A patent/ES8105913A1/es not_active Expired

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