A system for exchanging vectoring information between line cards of a vectoring group, comprising: a data connection; a first line card coupled to a first plurality of subscriber lines and configured to communicate discrete multi-tone signals across the plurality of subscriber lines, the first line card coupled to the data connection and configured to transmit a vectoring stream across the data connection, the vectoring stream having a plurality of time slots respectively corresponding to tones of the DMT signals communicated by the first line card across the first plurality of subscriber lines, the first line card configured to insert a first symbol for one of the tones communicated by the first line card into one of the time slots corresponding to the one tone communicated by the first line card, the first line card configured to transmit the first symbol across or receive the first symbol from one of the first plurality of subscriber lines, wherein the first line card is further configured to dynamically adjust a size of the one time slot in response to a change in bit loading for the tone corresponding to the one time slot; and a second line card coupled to a second plurality of subscriber lines and configured to communicate DMT signals across the second plurality of subscriber lines, the second line card coupled to the data connection, wherein the second line card is configured to transmit a second symbol across or receive the second symbol from one of the second plurality of subscriber lines, the second line card further configured to receive the vectoring stream from the data connection, to read the first symbol from the vectoring stream, and to perform vectoring based on the first symbol read from the vectoring stream, thereby compensating the second symbol for crosstalk that is induced by the first symbol in the second symbol when the first symbol is communicated across the one of the first plurality of subscriber lines and the second symbol is communicated across the one of the second plurality of subscriber lines. a data connection; a first line card coupled to a first plurality of subscriber lines and configured to communicate discrete multi-tone signals across the plurality of subscriber lines, the first line card coupled to the data connection and configured to transmit a vectoring stream across the data connection, the vectoring stream having a plurality of time slots respectively corresponding to tones of the DMT signals communicated by the first line card across the first plurality of subscriber lines, the first line card configured to insert a first symbol for one of the tones communicated by the first line card into one of the time slots corresponding to the one tone communicated by the first line card, the first line card configured to transmit the first symbol across or receive the first symbol from one of the first plurality of subscriber lines, wherein the first line card is further configured to dynamically adjust a size of the one time slot in response to a change in bit loading for the tone corresponding to the one time slot; and a second line card coupled to a second plurality of subscriber lines and configured to communicate DMT signals across the second plurality of subscriber lines, the second line card coupled to the data connection, wherein the second line card is configured to transmit a second symbol across or receive the second symbol from one of the second plurality of subscriber lines, the second line card further configured to receive the vectoring stream from the data connection, to read the first symbol from the vectoring stream, and to perform vectoring based on the first symbol read from the vectoring stream, thereby compensating the second symbol for crosstalk that is induced by the first symbol in the second symbol when the first symbol is communicated across the one of the first plurality of subscriber lines and the second symbol is communicated across the one of the second plurality of subscriber lines.