Fiber-Optic MXI-Express x4 is based on PCI Express technology. A Fiber-Optic MXI-Express x4 kit uses PCI Express switches to enable control of a PXI Express or CompactPCI Express chassis from a PC with an available PCI Express slot. The PCI Express switch architecture is transparent to device drivers, so no additional software is needed to support using PXI Express and CompactPCI Express devices in a chassis connected using Fiber-Optic MXI-Express x4.
The PXI Platform Services software on the PXI Platform Services CD or driver CD included with your PXI Express Fiber-Optic MXI-Express x4 hardware is required to provide chassis and controller identification for PXI features such as trigger routing and slot detection. The PXI Platform Services software is also included with the NI-DAQmx and NI-VISA drivers. For more information, refer to KnowledgeBase 3TJDOND8 at ni.com.
The link between the PC and the chassis is a x4 PCI Express link. This link is a dual-simplex communication channel comprised of low-voltage, differentially driven signal pairs. The link can transmit at a rate of 10 Gbps in each direction simultaneously, though protocol overhead and other inefficiencies will reduce the achievable throughput.
The following figure shows the basic architecture of Fiber-Optic MXI-Express x4. The PCIe-8375 consists of a PCI Express x4 card edge connector, a PCI Express switch, and one cabled Fiber-Optic MXI-Express x4 connector. The PXIe-8375 consists of two cabled Fiber-Optic MXI-Express x4 connectors, a PCI Express switch, and two PXI Express connectors.