What is Wi-Fi 5 (Wireless-AC)? - FlashRouters Router FAQ
ARRIS SURFboard 16x4 Cable Modem / AC1600 Dual-Band WiFi Router. Approved for XFINITY Comcast, Cox, Charter and most other Cable Internet providers for plans up to 300 Mbps. - Walmart.com
Motorola SBG6782-AC Surfboard eXtreme Cable Modem review: A complete, but bulky, cable Internet gateway - CNET