Ultra High-speed Internet and Wireless AC at your fingertips. The SURFboard SBG6900AC Wi-Fi Cable Modem is 3 products in one device: DOCSIS 3.0 Cable Modem, Dual-Band 802.11ac Wi-Fi Access Point and 4-port Gigabit Ethernet Router. Capable of download speeds up to 686 Mbps and Wi-Fi speeds up to 1900 Mbps per band, the SBG6900AC is an affordable, complete solution for your home network. And with built-in security you never have to worry. SURFboard. The Market Leader in modems.