The SCSI family of standards provides for many different transport protocols that define the rules for exchanging information between different SCSI devices. This standard defines the rules for exchanging information between SCSI devices using a PCI Express queuing layer. Other SCSI transport protocol standards define the rules for exchanging information between SCSI devices using other interconnects. This standard does not define the configuration of the PCI Express topology or the mechanisms for sending and receiving these messages across the PCI Express transport.