Hi Marcus, Thanks for the clarification. So the max rate for two channels on the B210 is 30.72Msps, right? Reading the 9361 manual, it seems that if one wants to operate in RX-only (dual-port half-duplex) mode, the 61.44Msps rate might be achievable (at the expense of no TX). Any idea if this modification has been tried out on the B210? It would be an invasive change since the AD9361 digital interface in the FPGA would need tweaks, but any thoughts on if it was theoretically possible or not.
Chintan On Sun, Sep 9, 2018 at 11:33 AM Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 09/09/2018 11:21 AM, Chintan Patel via USRP-users wrote: > > Hi, > > > > Two questions on the B210. > > > > 1. Generally speaking, are there are known issues transporting two RX > > channels at 61.44Msps over USB 3.0 on the B210. I know from a > > theoretical standpoint, the 5Gbps capacity of USB 3.0 has enough > > capacity to transport the dual-channel 16-bits i/q @ 61.44Msps. I also > > know that whether the host can keep up with this throughput depends on > > host configuration, load-balancing etc., but wanted to get a general > > sense of which bucket it falls under: a) i > > quite-typical-and-routine-scenario, b) > > possible-but-in-a-particular-context, or c) pushing-the-capabilities > > > > 2. Taking this thought a bit further - (our application needs 4 > > channels), if we had a powerful dedicated host machine, how > > feasible/unrealistic is to to have a configuration where the host is > > connected to two B210, via separate USB 3.0s and ingesting 4 channels > > worth of RX data at 61.44Msps. From a UHD driver standpoint, I am > > assuming this would just entail interfacing with two separate > > instances of streamers, but is there any pit-fall in the single > > host-to-two-B210 approach? > > > > Thanks, > > Chintan > > > It's not a driver or host-beefiness issue with B210. It's the way the > data clocks work on the AD9361 chip, and the interface to the FPGA. > > There's simply no way to make the AD9361 chip move two channels of data > out of itself (or, into itself) at the maximum data rate. > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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