USRP 2974

The USRP 2974 combines a high performance Intel based embedded mini-pc with a USRP X310, with integrated daughterboards.

Due to this combination, it is both a Compute Resource, as well as an SDR Resource.

Further Information can be found at ​Ettus Research

Block Diagram

The connection between the embedded PC and the FPGA can be done either over internal PCIe3.0 x4, or over internal 10G ethernet.

External data connections max out at 10 gigabits per second each, to the embedded PC and to the FPGA.

It is possible to bridge and forward the traffic from the internal 10g connection over SFP0, but this is untested and unsupported.

How to Use

The intel PC within the 2974 can be imaged with omf and logged into just like other COSMOS nodes (ssh root@sdr2…). From there, you can run uhd_find_devices, and you should see the attached X310 appear as a RIO0 resource. The X310 can be queried by uhd directly from the intel PC within the 2974 using the uhd arguments --args="resource=RIO0".

To access the X310 from another device on the network, you'll use the 10G interface seen in the block diagram above. This interface should be on the DATA1 subnet (see table).

Domain	DATA1 subnet
bed.cosmos	10.111.0.0/16
sb1.cosmos	10.38.0.0/16
sb2.cosmos	10.117.0.0/16

You'll need to make sure that the device you're using has an address on the DATA1 subnet so that it can access the X310 over the network. In order to find the ip address of the X310, you can log in to the 2974 and run the following command:

/usr/local/lib/uhd/utils/usrp_burn_mb_eeprom --args="resource=RIO0" --read-all

This will retrieve the current settings from the X310, including the ip addresses where it can be reached. Look for an address in the DATA1 subnet. You can use this address with commands such as uhd_usrp_probe in order to access the X310 over the network.