Sharing the Chassis Reference Clock Signals

Cable the reference clock signals on the synchronization modules in each chassis. Skip this step for 1-VST and 2-VST configurations.

Gather the following components.
Table 18. Reference Clock Component Quantities (Multi-Chassis Configurations)
Component Recommended Part Number Quantity
Synchronization Module: PXIe-6674T 781037-01 2
Clock Distribution Device: CDA-2990 784305-01 1
SMA-to-SMA Cable 137833-0150/0300/0600/1000 (0.150 m, 0.300 m, 0.600 m, and 1.000 m lengths) 3
Note One PXIe-6674T is required for each PXIe chassis that contains PXIe-5842 and PXIe-5655 modules, or requires a shared reference clock.
Note Use same length cables for connections between the splitter outputs and CLK IN of the PXIe-6674T modules to ensure the phase is the same between chassis.
  1. Connect CLK OUT on the PXIe-6674T module in Chassis 0 to the clock distribution device, as shown in the following figure.
    Figure 8. Connecting the Reference Clock Signals (2-PXIe Chassis System Shown)

    PXIe-6674T modules cabled by way of the CDA-2990 clock distribution device.

  2. Connect CLK IN on both PXIe-6674T modules to the clock distribution device.