On Fri, Jan 15, 2010 at 15:08, Tom Gross <[email protected]> wrote: > yes of course we have two separate gig-e cards. if the usrp2 is > sending us "pause" commands then it seems evident the usrp2 is having > trouble keeping up, not the computer.
The host software, when creating a data stream to be sent to the USRP2 for TX, will create the data as fast as the processor allows, and TX on the GbE at full wire rate. The USRP2, however, is "consuming" data at a fixed rate proportional to the configured TX RF baseband sample rate. Even at the fastest sample rate, 25 Msps (interpolation rate 4), this is only 800 Mbps + framing overhead. So the USRP2 doesn't have problems "keeping up", it's just that the host can create the digital sample stream faster than real time, so the USRP2 pauses it periodically to keep the average data rate down to what is needed. Johnathan _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
