[Discuss-gnuradio] Synchronizing multiple USRPs

Hello,

I have eight (08) USRP N210s that has been synchronized using 10MHZ and 1PPS reference. I am receiving data from them using a gigabit ethernet switch to my computer. 

My question is when I will receive packets from all of them through a single switch, how will I know the time reference for each sample? 

Thanks,

Khalid.