Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M7/00—Arrangements for interconnection between switching centres
  • H04M7/16—Arrangements for interconnection between switching centres in systems employing carrier frequencies
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
  • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
  • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/02—Selecting arrangements for multiplex systems for frequency-division multiplexing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
  • H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
  • H04Q5/245—Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Devices For Supply Of Signal Current (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=27509437

Family Applications (2)

Family Applications After (1)

Country Status (6)

• 1969
  • 1969-07-31 NL NL696911709A patent/NL147914B/xx unknown
  • 1969-08-07 AT AT761769A patent/AT312699B/de not_active IP Right Cessation
  • 1969-08-08 SE SE6911075A patent/SE399503B/sv unknown
  • 1969-08-08 BE BE737282D patent/BE737282A/xx unknown
  • 1969-08-08 GB GB39776/69A patent/GB1272830A/en not_active Expired
  • 1969-08-08 SE SE7213159A patent/SE388524B/sv unknown
  • 1969-08-09 JP JP44063241A patent/JPS5243041B1/ja active Pending
• 1977
  • 1977-06-14 JP JP7038677A patent/JPS5440884B1/ja active Pending

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