USRP B210 Driver Setup on TelcoChisel

The Ettus Research USRP B210 is the most versatile SDR platform for telecom security testing, supporting 2×2 MIMO with 56 MHz bandwidth from 70 MHz to 6 GHz. This guide covers complete driver installation, firmware flashing, USB buffer optimization, and PREEMPT_RT kernel configuration for zero-underrun operation on TelcoChisel.

Prerequisites

• TelcoChisel OS (4.0.0 or later recommended)
• Ettus USRP B210 with USB 3.0 cable
• USB 3.0 port (blue connector) — USB 2.0 will limit bandwidth

Step 1: Verify USB Connection

# Check USB detection
lsusb | grep -i ettus
# Expected: Bus 002 Device 003: ID 2500:0020 Ettus Research LLC USRP B200

# Verify USB 3.0 speed (important for high-bandwidth captures)
lsusb -t | grep -A2 "2500:0020"
# Look for "5000M" (USB 3.0) not "480M" (USB 2.0)

Step 2: Install/Verify UHD Drivers

TelcoChisel pre-installs UHD, but verify the version:

# Check UHD library version
uhd_config_info --version
# Expected: UHD 4.6.0 or later

# Verify UHD firmware images are present
uhd_images_downloader --list-targets | head -20

If UHD needs updating:

# Update UHD from TelcoChisel repositories
sudo apt update && sudo apt install -y uhd-host libuhd-dev uhd-firmware

Step 3: Download FPGA Firmware

# Download B210 FPGA images (required for first-time setup)
sudo uhd_images_downloader

# Verify firmware files exist
ls -la /usr/share/uhd/images/ | grep b2
# Should show: usrp_b200_fpga.bin, usrp_b210_fpga.bin

Step 4: Detect and Test the Device

# Scan for connected USRP devices
uhd_find_devices

# Expected output:
# --------------------------------------------------
# -- UHD Device 0
# --------------------------------------------------
# Device Address:
#     serial: 318B42
#     name:
#     product: B210
#     type: b200

# Run comprehensive hardware self-test
uhd_usrp_probe

Step 5: USB Buffer Optimization

Critical for preventing buffer underruns at high sample rates:

# Increase USB buffer size (temporary — active until reboot)
sudo sysctl -w net.core.rmem_max=33554432
sudo sysctl -w net.core.wmem_max=33554432

# Make permanent
echo "net.core.rmem_max=33554432" | sudo tee -a /etc/sysctl.d/99-usrp-buffers.conf
echo "net.core.wmem_max=33554432" | sudo tee -a /etc/sysctl.d/99-usrp-buffers.conf
sudo sysctl -p /etc/sysctl.d/99-usrp-buffers.conf

Step 6: USB Permissions (udev Rules)

# Verify TelcoChisel UHD udev rules are installed
cat /etc/udev/rules.d/uhd-usrp.rules
# Should contain: ATTR{idVendor}=="2500", MODE="0666"

# If missing, create the rule
echo 'ATTR{idVendor}=="2500", ATTR{idProduct}=="0020", MODE="0666"' | \
  sudo tee /etc/udev/rules.d/99-uhd-usrp.rules
sudo udevadm control --reload-rules
sudo udevadm trigger

Step 7: PREEMPT_RT Kernel Verification

TelcoChisel ships with a PREEMPT_RT kernel for zero-underrun SDR operation:

# Verify RT kernel is active
uname -r
# Expected: 6.8.0-rt-telco

# Check preemption model
cat /sys/kernel/realtime
# Expected: 1

# Set real-time scheduling priority for UHD threads
sudo chrt -f 99 uhd_rx_samples_to_file --args "type=b200" --rate 30.72e6 --freq 2140e6 --duration 5 --file /tmp/test.cf32

Step 8: Validation Test

Run a full bandwidth test at 5G-ready sample rates:

# Test 30.72 MS/s (20 MHz LTE/5G bandwidth) for 10 seconds
uhd_rx_samples_to_file --args "type=b200" --rate 30.72e6 --freq 2140e6 --duration 10 --file /tmp/bandwidth-test.cf32

# Check for underruns in output — should see 0
# "U" characters in output indicate buffer underruns

# Test MIMO 2x2 configuration
uhd_rx_samples_to_file --args "type=b200" --channels "0,1" --rate 15.36e6 --freq 2140e6 --duration 5 --file /tmp/mimo-test.cf32

Troubleshooting

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