Telephone Modems and ADSL

• Both use the 1-pair VG UTP line running to the subscriber’s home

  • Already installed, so no extra cost of running a new line

• Telephone modems send analog signals

  • This is what the traditional telephone system expects

• ADSL

  • Send digital signals for data (digital subscriber line)
  • Requires special equipment at the end office switch (DSLAM)

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