Initial Settings (DOCSIS 4.0 Upstream)

Initial Settings contains a group of parameters to automatically or manually control FFT Length, Cyclic Prefix, and Rolloff Period.

Parameter	Description
Auto Detect	Determines whether the initial settings (FFT Length, Cyclic Prefix, and Rolloff Period) are automatically or manually configured. Any user-specified initial settings are ignored and grayed out. Default: Enabled
Auto Detect Enabled
	The software attempts to detect the correct FFT Length, Cyclic Prefix, and Rolloff Period settings. Any user-specified initial settings are ignored and grayed out.
Auto Detect Disabled
	FFT Length sets the FFT length for the DOCSIS Upstream transmission. Default: 2048 Range: 2048, 4096
	Cyclic Prefix allows selection of the cyclic prefix (CP) sizes allowed by the specification, from 96 to 640 samples. Default: 0.46875 us (96 Tsd) Choices: 0.46875 us (96 Tsd), 0.625 us (128 Tsd), 0.78125 us (160 Tsd), 0.9375 us (192 Tsd), 1.09375 us (224 Tsd), 1.25 us (256 Tsd), 1.40625 us (288 Tsd), 1.5625 us 320 Tsd), 1.875 us 386 Tsd), 2.5 us (512 Tsd), 3.125 us (640 Tsd)
	Rolloff Period: allows selection of the rolloff period (RP) sizes allowed by the specification, from 0 to 224 samples. Default: 0.234375 us (32 Tsd) Choices: 0 us (0 Tsd), 0.234375 us (32 Tsd), 0.3125 us (64 Tsd), 0.46875 us (96 Tsd), 0.625 us (128 Tsd), 0.78125 us (160 Tsd), 0.9375 us (192 Tsd), 1.09375 us (224 Tsd)