Physical Media

• physical link: transmitted data bit propagates across link

• guided media:

  • signals propagate in solid media: copper, fiber

• unguided media:

  • signals propagate freelye.g., radio

Twisted Pair (TP)

• two insulated copper wires

  • Category 3: traditional phone wires, 10 Mbps ethernet
  • Category 5 TP: 100Mbps ethernet

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