IES-708-22A supports 16-layer and 32-layer TCPAM modulations. Operators can select one of these in "auto" or "force" mode; the former determines the modulation by negotiating with the peer device, while the latter forces the use of configured modulation. In order to avoid the cross-line noise, many Telco operators restrict the power spectrum density for G.SHDSL service but allow the transmission rate of the links to increase....