Streaming using ethernet

Question

Hello
i looking for a suggestion a practical one. i want to stream data using ethernet cable from controller pxie 8130 ethernet slot,i have connected the controller to my PC using an ethernet cable(like form pxi 5142 digitizer onbord memory to controller 8130 memory and then from controller  memory to my PC).
1-Can i make an application for acqusition on my PC labview, then using this can i acquire the data direct form controller
    memory to PC memory.
2- Or  i have to store my data first form digitizer to controller Hardisk and then from controller hardisk to pc  i can move
     it using some other application like clint/server since it then would be a file to transfer.
3- what can be the bottleneck's if the memory of PC,controller,digitzer is 256Mb each.
 Regards 

Answer 1

Hello COMSIS, 
Let's brake this down into small parts here and step through the data as it goes from signalall the way back to host computer. I'll assume that you are sampling on one channel at the full rate.  Since we can sample at 100 MS/s and each sample is streamed back as 2 Bytes of data, we would be streaming at 200 MB/s whichshould work with your chassis (should be a 250 MB/s limit as per PCIe spec's).  So, your card will not be a bottle neck.
Once you bring the data back into LabVIEW, you will more than likely have to use a producer/consumer architecture.  Your producer loop will put your data into a queue that will be read out in your consumer queue.  In the consumer queue you will want to use TCP comunication to stream your data back to your non PXI computer.  This DevZone outlines how you would do it in an embedded application, but you can also use it with a Windows based PXI system.
Here my knowledge of LabVIEW memory allocation and TCP communication speeds is a little lacking, so we might not be able to keep up with the data rates and so you may need to go with your other idea of storing it to a disk and then FTP'ing it back to your host computer.  To get the best answers, I would post the second half of your question on a LabVIEW board and just include a link back to this thread.  Once you post there, post back on this thread with a link to the LabVIEW post so that anyone who comes onto this post later can get the complete answer.
Message Edited by ColeTrain on 01-27-2010 05:52 PM
ColeR
Field Engineer