MIMO cable and USRP N210

GNU Radio
1

Dear all,
I am trying to configure a simple flow graph where I have 2 USRP N210
connected using a mimo cable.
The ethernet is connected only to the device with IP 192.168.20.2.

my python code is:

self.uhd_usrp_source_0 = uhd.usrp_source(
device_addr= “addr=192.168.20.2, addr=192.168.20.3”,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=2,
)

_config = uhd.clock_config()
_config.ref_source = uhd.clock_config.REF_MIMO
_config.pps_source = uhd.clock_config.PPS_MIMO
self.uhd_usrp_source_0.set_clock_config(_config)

and my problem is that I can see the received led turned only on the
192.168.20.3 device.

Moreover, it’s not clear what channels are and how I should address
the 2 devices.

Thanks

Vanessa

2

self.uhd_usrp_source_0.set_clock_config(_config)

The devices are addressed incorrectly; you need key=. See
http://files.ettus.com/uhd_docs/manual/html/usrp2.html#multiple-device-configuration

and my problem is that I can see the received led turned only on the
192.168.20.3 device.

Moreover, it’s not clear what channels are and how I should address
the 2 devices.

I think the docs above will make this clearer.

Good luck!
-josh