Description: A list of traffic matrix entries which collect statistics for conversations between two subnetwork-level addresses. This table is indexed first by the destination address and then by the source address to make it convenient to collect all conversations to a particular address. The probe will populate this table for all network layer and application layer protocols in the protocol directory table whose value of protocolDirMatrixConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirMatrixConfig value of supportedOff(2). The probe will add to this table all pairs of addresses that fits the xsHostFilter. Further, this table will only contain entries that have a corresponding entry in the xsSubnetMatrixSDTable with the same source address and destination address.