Cisco 1921 Router with T1 Module (1921/K9)Cisco 1921 Router Description: The Cisco 1921 belongs to the 1900 series of Integrated Services Routers with a long list of features as well as advanced security. The Cisco 1921 K9 comes with Cisco's IOS software, dual Gigabit Ethernet ports, AUX port, USB port Energy Monitoring Controls, intrusion prevention, and so much more! Cisco 1921 K9 Features: Multicore CPU's Power over Ethernet (PoE) Cisco IOS Software USB 2. 0 Port Aux Port Console Port Dual