This read-create pointer identifies the traffic descriptor row that applies to the receive direction of this connection endpoint, and for connections that negotiate parameters through signaling, such as ABR connections, it points to the desired parameters while casfVcEndptRxNegTrafficDescrRow points to what was actually negotiated. Because signaling can grant less than what was requested, comparing this pointer's descriptor against the negotiated one tells an admin whether the network actually delivered what was asked for on the receive side. If this row points to a descriptor requesting a 2 Mbps PIR but the negotiated row shows only 1 Mbps, the connection was admitted at half its requested receive rate.