Realtek Rtl8188cu Wireless Lan 80211n Usb 20 Network Adapter Link < Ad-Free >

Commentary: Realtek RTL8188CU Wireless LAN 802.11n USB 2.0 Network Adapter — Overview, practical tips, and troubleshooting

Summary

For Linux (Ubuntu/Debian/Raspberry Pi)

The RTL8188CU is famous for dropping connections on Linux. Do not use the default rtl8192cu driver that comes with the kernel—it is broken. Commentary: Realtek RTL8188CU Wireless LAN 802

• Chipset: Realtek RTL8188CU
• Interface: USB 2.0 (backward compatible with USB 1.1)
• Wireless Standards: IEEE 802.11b/g/n (up to 150 Mbps on 802.11n)
• Frequency Band: 2.4 GHz only (no 5 GHz support)
• Antenna: Typically 1x1 SISO (Single Input Single Output), often with an external RP-SMA antenna connector on many adapters.
• Modulation: OFDM, CCK, DSSS
• Security: WEP 64/128, WPA, WPA2, WPS
• Operating Voltage: 5V via USB port
• Form Factor: Usually a dongle with a plastic casing, sometimes with a detachable antenna.

• Chipset: Realtek RTL8188CU
• Standard: 802.11n (backward compatible with b/g)
• Interface: USB 2.0
• Max Speed: Up to 150 Mbps (typical real-world: 50–90 Mbps)
• Frequency: 2.4 GHz only (no 5 GHz support)

• Ensure your router is broadcasting on the 2.4 GHz band. This adapter cannot see or connect to 5 GHz networks.
• Forget the network in your Wi-Fi settings and try re-entering the password.

3. Disable 40 MHz Bandwidth (For Dropped Links)

In the driver’s advanced settings (Device Manager > Properties > Advanced): Chipset: Realtek RTL8188CU Interface: USB 2