Hi CDL - As you also replied on the USRP list & this is a UHD and/or Ettus Research issue, not a GR issue, we're moving the discussion to just that email group & leaving this one. You'll still get support, just there & not here. - MLD
On Thu, Sep 10, 2015, at 06:40 AM, cdl wrote: > i am using one usrp b200,to do a tx rx loopback,the tx connect to the > rx when i exe the grc i got the error message -- Asking for clock rate > 51.200000 MHz... OK -- Asking for clock rate 51.200000 MHz... OK -- > Asking for clock rate 51.200000 MHz... OK -- Asking for clock rate > 51.200000 MHz... OK UU (python2:2705): IBUS-WARNING **: Unable to > connect to ibus: 无法连接： 拒绝连接 terminate called after throwing an > instance of 'uhd::runtime_error' what(): RuntimeError: usb tx2 > transfer status: LIBUSB_TRANSFER_ERROR > > i wants to konw what is this message mean so that i can fix it with > myself,thank you all
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