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  • Application: Off Hook Telephone Switching (.pdf)
    In the past, disconnecting a telephone connection required the placement of the handset on the receiver. This placement activated a mechanical switch which created the electrical disconnect. The mechanical switch is subject to any spillage or debris clogging the contacts which will affect
  • Smart Computing Article - Internet Connection Devices
    they're causing interference. You can perform an unscientific test for possible noise on your telephone line by picking up the receiver and hitting a key other than zero. Listen for any stray static on the line. Other than hardware devices, a corroded telephone line connector or exposed wiring
  • | Electronics Industry News for EEs & Engineering Managers
    XML derivatives seek to pry open telco switches Derivatives of the Internet's Extensible Markup Language are taking center stage in the effort to force open the formerly closed world of circuit-based switches in the telephone company central office. The advent of tools that leverage Web scripting
  • Sensor Sense: Optical data transmission
    represents a logic 1 value while the other frequency represents a logic 0. This resembles the way modems use two different audio tones to send data over telephone lines. The signal from the infrared sensor in the receiver feeds narrow-band filters tuned to the two frequencies. The filters minimize any

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