Digital Subscriber Line - Transmission Methods

Transmission Methods

Transmission methods vary by market, region, carrier, and equipment.

  • 2B1Q: Two-binary, one-quaternary, used for IDSL and HDSL
  • CAP: Carrierless Amplitude Phase Modulation - deprecated in 1996 for ADSL, used for HDSL
  • TC-PAM: Trellis Coded Pulse Amplitude Modulation, used for HDSL2 and SHDSL
  • DMT: Discrete multitone modulation, the most numerous kind, also known as OFDM (Orthogonal frequency-division multiplexing)

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