Sym Clk Err (802.11b/g DSSS/CCK/PBCC)

This is the symbol clock frequency error, which is the difference between the ideal and actual symbol clock frequency in ppm. A symbol clock frequency that is less than ideal will make the symbol time to take longer than required. A symbol clock frequency that is greater than ideal will make the symbol times take less time than required. In either case this increases the signal's EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format.. The resultant error value is a unitless fraction, which is multiplied by 1,000,000 to obtain SymClkErr in ppm.

The 802.11b and 802.11g standards require the symbol clock frequency error tolerance to be ± 25 ppm maximum.