OFDM - Orthogonal Frequency Division Multiplexing is a technology that transmits multiple signals simultaneously over a single transmission path on a single channel. Each signal travels within its own unique frequency range, carrier, which is modulated by the video, data. The spread spectrum technique distributes the data over a large number of carriers that are spaced apart at precise frequencies. This spacing provides the "orthogonal" in this technique which prevents the demodulators from seeing frequencies other than their own. The benefits of OFDM are high spectral efficiency, resiliency to RF interference, and lower multi-path or reflection, distortion.