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This practice specifies digital test signals suitable for evaluating the low-frequency response of equipment handling serial digital video signals as defined by ANSI/SMPTE 259M. These test signals are fully valid digital component video as defined in ANSI/SMPTE 125M. They are also useful digital composite video signals suitable for testing serial equipment in an out-of-service mode. Although a range of signals will produce the desired low-frequency effects, two specific signals are defined to test cable equalization and phase locked loop (PLL) lock-in, respectively.