LPM mode is recommended for short-reach and low-reflection channel applications with channel losses of 15 dB or less at the Nyquist frequency. LPM is preferred for applications where non-random data patterns are used. As RX Equalizer (DFE and LPM) indicates, in LPM mode the AGC is fixed. Generally, for low loss channels (less than 15 dB at Nyquist), it is advised to not use any TX emphasis and let the RX adaptation handle all the equalization of the link.
LPM mode does not require data scrambling for proper adaptation. For 8B/10B applications in LPM mode, repeated patterns (idle patterns) with or without scrambling can be used during adaptation.