1. A method in a Vector Control Entity associated with a plurality of digital subscriber lines forming a vectoring group comprising a group A of lines having the same priority, the method comprising: when partial-vectoring resources are to be allocated among the lines within the vectoring group: calculating a rate balancing metric, RBM, for each line i within the group A, indicative of a ratio between a bit rate of line i with a current vectoring resource allocation, and an estimated bit rate of line i assuming approximately no crosstalk within the vectoring group, calculating an updated RBM for any line within the group A subjected to changes in vectoring resource allocation, and allocating partial-vectoring resources to the line/s within the group A, based on the calculated RBMs, such as to reduce the difference in RBM between the lines, thus enabling a fair bit rate distribution among lines of similar priority when applying partial vectoring.