The Channel Operating Margin . (COM) is a figure of merit for a channel derived from a measurement or simulations of its scattering parameters. COM is a method to compliance check if a channel will work with a variety of different transmitters and receivers. The COM method reduces the overdesign that many other compliance check methods suffer from. The risk of overdesign increases with the speed of the link. The higher the speed is the higher is the risk of overdesign with added extra cost as result.
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