A communications system employing discrete multi-tone modulated signals on a communications channel formed by inductively-coupled pipe. The use of such a conversion method with left-to-right arithmetic processing improves hardware implementation of the method. The memory controller provides a clock signal for synchronizing the operations of the devices. A status report is generated for each acknowledge mode RLC instance mapped to the HS-DSCH by a radio link control device after the MAC-hs flushes the reordering buffer.