With 100BASE-TX hardware, the raw bits go through 4B5B binary encoding to generate a series of 0 and 1 bits clocked at 125 MHz; the 4B5B encoding provides DC equalization and spectrum shaping (see the standard for details).
The raw bits go through 4B5B binary encoding to generate a series of 0 and 1 bits clocked at 125 MHz. This was with 100BASE-TX hardware. The 4B5B encoding provides DC equalization and spectrum (see the standard for details). These DC equalization are shaping. Spectrum are shaping.