Multiplex LVDS

[Mandy]

I need to multiplex LVDS from 8 UUT's to the receiver, I have 6 LVDS lines lines clk+/-, data0 +/-, and data1 +/-,  So thats 48 in and I need to select which 6 out. Does anybody have any ideas about how to do this.  Anything PXI?

Thanks,

Amanda

[_Brian_]

Mandy:

Looking at the switch product selection guide, 

you could use a single PXI-2576 configured in the Octal 8x1 2-Wire topology.  Use three banks, one for each +/- signal pair of your UUT.  You could connect to the first UUT by closing three channels at once, one on each of the three banks: say, ch0->com0, ch8->com2, and ch16->com4.  This yields 3 x 2-wires which is 6-wires connected at once.  Then you could select the next UUT by closing ch1->com0, ch9->com2, and ch17->com4.

Brian

[Mandy]

I forgot to mention that I need a bandwidth of 60MHz.

[_Brian_]

Mandy:

For that bandwidth, you could use 3 PXI-2593s in the Dual 8x1 Mux topology.

To connect the first UUT, connect:

Switch1/ch0->com0, Switch1/ch8->com1

Switch2/ch0->com0, Switch2/ch8->com1

Switch3/ch0->com0, Switch3/ch8->com1

For the second UUT, connect:

Switch1/ch1->com0, Switch1/ch9->com1

Switch2/ch1->com0, Switch2/ch9->com1

Switch3/ch1->com0, Switch3/ch9->com1

Brian

[Poormanphysics]

Hello Brian:

My google search brought me back to my NI community. I appreciate very much that this problem on Mux for LVDS has a thread. Now my question is somewhat similar I had hope that I could extend your answer to my current design requirement. Here, I have 40 channels of LVDS which roughly runs to 200MBps (or 200Mhz) I intend to MUX them in two levels 1 in every 20 x 2  matrix form what do you propose? Would any of the NI hardware do the job?

Regards,

Berns B.

[Alex A.]

Hi Berns,

The bandwidth you require dictates that you will be need an RF switch module.  The big decision you would have to make is if you want a PXI or SCXI system. 

Also, I'm not sure what you meant by "two levels 1 in every 20 x 2."  Perhaps you can attach a drawing of the MUX you wish to achieve and I could better make a recommendation for you.