The 4xflexi supports CAP, DMT, and G.lite line encoding. The line card is designed for use in one of the following configurations: Direct Connect with a POTS splitter - -Provisions one modem directly and is physically connected to one specific subscriber line through the POTS splitter. Direct Connect without a POTS splitter - -Provisions one modem directly and is physically connected to one specific subscriber line through the main distribution frame (MDF) connections.The 4xflexi Supports four ADSL modem connections. Converts ADSL modulation from the line into digital data streams to and from the network interface line card. Negotiates the line rate with the customer premises equipment (CPE) when it trains and bases the rate on line quality and distance. If provisioned, the 4xflexi rate adapts to the maximum bit rate that is negotiable on the line. The maximum bit rate settings are provisioned in the management software.