SB2

RF Connections

The X310's connected to the nodes in this sandbox are interconnected via coax cables as follows with a 30dB attenuator on the TX/RX side of each link for protection. This setup is designed to facilitate FDD dependent experiments.

Networking Setup (eth2)

Each X310 is connected to its respective node through a 10G interface adapter installed in Port 1 of the USRP. In this configuration, the X310 will have a default IP address of 192.168.40.2 (see ​X310 User Manual). To setup network connectivity, make sure eth2 is configured with an address in the 192.168.40.0/24 subnet .

Using images based on baselines before June 12, 2017

Images built using baselines prior to June 12, 2017 may not work correctly. After imaging, the node may not be accessible via SSH or the ethernet interface order will be wrong due to the add-on NIC (for X310 connectivity) changing the order of the ethernet interfaces (making the USRP inaccessible). To repair your image, connect to the node (if SSH isn't working, connect via the CM serial console) and run the following commands.

if ! grep -i "blacklist mlx4_core" /etc/modprobe.d/blacklist.conf; then echo "blacklist mlx4_core" >> /etc/modprobe.d/blacklist.conf; fi

if ! grep -i "mlx4_core" /etc/modules; then echo "mlx4_core" >> /etc/modules; fi

depmod -a

update-initramfs -u

reboot