Willy Tarreau's stuff: Connecting a USB serial console to WRT1900ACS
Amazon.com: Linksys WRT1900AC Dual-Band+ Wi-Fi Wireless Router with Gigabit & USB 3.0 Ports and eSATA, Smart Wi-Fi Enabled to Control Your Network from Anywhere : Electronics
LINKSYS WRT1900AC lot of 2 Dual-Band Gigabit Wi-Fi Router. | eBay
WRT1900ACS Dual-Band Wi-Fi Router with Ultra-Fast 1.6 GHz CPU | Linksys: US