68 Keysight E8491B IEEE 1394 PC Link to VXI User GuideIEEE 1394 Fundamentals and Interface Overview Using this ChapterOptimizing the ConfigurationI/O performance is impacted slightly by the hardware configuration.The VXImainframe closest to the PC (root node) has the highest priority. For example, ifinstruments in VXI mainframes 1 and 3 (Figure 4-1) contend for the bus at thesame time, the root node will grant mainframe 1 access to the bus first. However,the bus’s fair arbitration protocol (covered in the next section) ensures that eachdevice has equal access to the bus and that devices closer to the root are notcontinually granted the bus.
