Classifications

• • 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
  • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
  • H04Q5/14—Signalling by pulses
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
  • H04L15/04—Apparatus or circuits at the transmitting end
  • H04L15/22—Apparatus or circuits for sending one or a restricted number of signals, e.g. distress signals
• • 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
  • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
• • 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
  • H04M1/53—Generation of additional signals, e.g. additional pulses
  • H04M1/54—Arrangements wherein a dial or the like generates identifying signals, e.g. in party-line systems

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Telephonic Communication Services (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7337203

Family Applications (1)

Country Status (2)

• 0
  • BE BE449999D patent/BE449999A/xx unknown
• 1942
  • 1942-05-01 DE DEM154099D patent/DE763327C/de not_active Expired

Also Published As

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