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"Orthogonal frequency-division multiplexing (OFDM), which is used in both the ITU Asymmetric Digital Subscriber Line (ADSL) and IEEE 802.11 Wireless LAN standards, has some of its roots in the Packet Ensemble Protocol. In particular, these protocols reuse PEP's concept of carrying a single data link over many lower rate frequency-division multiplexing sub-carriers.
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