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long-distance transmission
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Infographic map showing the route of the first transcontinental telephone line completed in 1914, stretching from San Francisco to New York and passing through 13 states. Key facts include 130,000 telephone poles used, a 4,750-mile record call, and notable speakers for the ceremonial first call in 1915 such as Alexander Graham Bell and Thomas Watson. Insets highlight the cost per call, the amount of copper wire used, and a historical illustration of an early telephone. Block diagram of a digital telecommunications system. Two types of telephone switching networks(Left) The tandem, or local, network serves local offices and users; (right) the toll, or long-distance, network switches calls over long-distance circuits.
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long-distance transmission

communications
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Infographic map showing the route of the first transcontinental telephone line completed in 1914, stretching from San Francisco to New York and passing through 13 states. Key facts include 130,000 telephone poles used, a 4,750-mile record call, and notable speakers for the ceremonial first call in 1915 such as Alexander Graham Bell and Thomas Watson. Insets highlight the cost per call, the amount of copper wire used, and a historical illustration of an early telephone.
The first transcontinental telephone line Map of the first transcontinental telephone line with details of the first transcontinental call, which took place on January 25, 1915.

Long-distance transmission in telecommunications refers to sending information over significant distances using electromagnetic means. This involves overcoming challenges like noise and interference to ensure reliable communication.1

Key aspects include:

  • Digital Transmission: Modern systems largely use digital methods for high reliability and lower costs. Analog signals, like voice, must be converted to digital form.1
  • Signal Processing: Signals undergo source encoding to reduce redundancy and channel encoding to detect and correct errors.1
  • Transmission Media: Historically, copper wires were used, but faced issues with interference and attenuation. Innovations like loading coils and amplifiers improved long-distance capabilities. Later, coaxial cables and microwave links offered higher capacities. Today, fiber optics are prevalent for high-capacity transmission.2345
  • Data Transmission: This involves sending and receiving data via cables or wireless systems. Modems are crucial for translating digital computer data into formats compatible with transmission lines.6
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7 Britannica Sources
  1. telecommunication
  2. data transmission
  3. telephone - Problems of interference and attenuation
  4. telephone - Coaxial cable
  5. telecommunications media - Applications of wire
  6. telephone - Microwave link
  7. long distance

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