# Apply SSC Correction

The Apply SSC Correction option lets you can tell the clock recovery software whether SSC (spread-spectrum clocking) is being used, and if it is, what its parameters are. This information improves the performance of clock recovery.

- SSC Spread Type — Specifies the type of SSC being used:

  - Center Spread — The waveform symbol rate is modulated to lower and higher frequencies about the specified symbol rate. The signal's average data rate stays the same.

  - Up Spread — The waveform symbol rate is modulated to a higher frequency and back. The signal's average data rate increases by half of the spread amount.

  - Down Spread — The waveform symbol rate is modulated to a lower frequency and back. The signal's average data rate decreases by half of the spread amount.

- SSC Spread Percent — Specifies the magnitude of the symbol rate change (spread) as a percent.