A list of history objects that are recorded for each RTT operation. The history collection table has four indices. Each described as follows: - The first index correlates its entries to a conceptual RTT control row via the rttMonCtrlAdminIndex object. - The second index uniquely identifies the results of each 'life' as defined by the rttMonCtrlOperRttLife object. - The third index uniquely identifies the number of buckets in a life. A bucket will contain one sample per bucket if the rttMonCtrlAdminRttType object is set to any value other than 'pathEcho'. If the rttMonCtrlAdminRttType object is set to 'pathEcho', a bucket will contain one sample per hop along a path to the target (including the target). - The fourth index uniquely identifies the number of samples in a bucket. Again, if the rttMonCtrlAdminRttType object is set to 'pathEcho', this value is associated with each hop in an ascending order, thus for the first hop on a path, this index will be 1, the second will be 2 and so on. For all other values of rttMonCtrlAdminRttType this will be 1.