Sets the minimum reserved downstream net data rate, in bits per second, guaranteed to this bearer channel specifically when dynamic rate adaptation (xdsl2LConfProfRaModeDs='dynamicRa') is in effect, protecting it from being squeezed to nothing when the line reallocates rate dynamically. An operator uses this to guarantee a baseline downstream rate for a channel carrying, say, a fixed-bandwidth video service even as the rest of the line's rate adapts.