My PXIe-8240 Can't Reach Its Maximum Data Rate

Updated Oct 29, 2019

Reported In

Hardware

  • PXIe-8240
  • PXIe-1075

Issue Details

I have brought a PXIe-8240 to transfer data at 40 Gb/s with an Ethernet port.
When I plug the module in my chassis (a PXIe-1075), the data rate is less than 4 Gb/s.

Why can't my PXIe-8240 reach the specification? 

Solution

The issue comes from your chassis, in its datasheet, there is a part on High Performance for Instrumentation Requirements:

This part precises that the transfer rate will be at 1 GB/s maximum. That makes a maximum of 8 Gb/s.
So in this case, the chassis limits the transfer rate of the PXIe-8240.