This procedure defines the measurement procedure for determining the ratio of carrier to thermal noise and 'noise-like' interference for broadband telecommunications system components. The test involves measuring the noise levels, or the combined noise plus 'noise-like' intermodulation product levels, relative to the carrier level of a CW signal. The noise contribution of the test equipment is also measured to allow for correction of readings near the test equipment noise floor. ANSI/SCTE 96 2003, Cable Telecommunications Testing Guidelines, has additional definitions common to this and other SCTE test procedures.