Method for transmitting data between a number of distribution point units (DPU's) and a number of end-user devices, over a plurality of lines, said method comprising: grouping said plurality of lines in at least a first set and a second set; allocating a first number of time slots to said first set; and a second number of times slots to said second set; allowing the lines of said first set to simultaneously transmit data during said first number of time slots; and allowing the lines of said second set to simultaneously transmit data during said second number of time slots, wherein said allowing is controlled in such a way that said first set and said second set transmit at different moments in time; characterized in that the method further comprises: assigning a first and second downstream/upstream ratio for said first and said second set, respectively; said first and second downstream/upstream ratio defining the number of time slots of said first number and said second number that may be used for downstream transmission and upstream transmission, respectively; wherein downstream transmission corresponds with a transmission from a DPU to an end user device and upstream transmission corresponds with a transmission from an end user device to a DPU; wherein said first set and said second set comprises at least two lines; wherein for said first and said second set a first and a second offset time is determined, said first and said second offset time indicating the start of a transmission period for said first set and said second set with respect to a common time reference, respectively; wherein said first and said second set is allowed to start transmission at said first and said second offset time (δ 1;δ 2) during a first and a second period (S 1,DS;S 2,DS) corresponding with said first and said second downstream/upstream ratio, respectively. grouping said plurality of lines in at least a first set and a second set; allocating a first number of time slots to said first set; and a second number of times slots to said second set; allowing the lines of said first set to simultaneously transmit data during said first number of time slots; and allowing the lines of said second set to simultaneously transmit data during said second number of time slots, wherein said allowing is controlled in such a way that said first set and said second set transmit at different moments in time; characterized in that the method further comprises: assigning a first and second downstream/upstream ratio for said first and said second set, respectively; said first and second downstream/upstream ratio defining the number of time slots of said first number and said second number that may be used for downstream transmission and upstream transmission, respectively; wherein downstream transmission corresponds with a transmission from a DPU to an end user device and upstream transmission corresponds with a transmission from an end user device to a DPU; wherein said first set and said second set comprises at least two lines; wherein for said first and said second set a first and a second offset time is determined, said first and said second offset time indicating the start of a transmission period for said first set and said second set with respect to a common time reference, respectively; wherein said first and said second set is allowed to start transmission at said first and said second offset time (δ 1;δ 2) during a first and a second period (S 1,DS;S 2,DS) corresponding with said first and said second downstream/upstream ratio, respectively.