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==Transmission modulation methods== Transmission methods vary by market, region, carrier, and equipment. * [[Discrete multitone modulation]] (DMT), the most common kind, also known as [[Orthogonal frequency-division multiplexing]] (OFDM) * [[Trellis-coded pulse-amplitude modulation]] (TC-PAM), used for [[HDSL2]] and [[SHDSL]] * [[Carrierless amplitude phase modulation]] (CAP), deprecated in 1996 for ADSL, used for HDSL * [[Two-binary, one-quaternary]] (2B1Q), used for IDSL and HDSL
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