The Cisco 678 is an asymmetric digital subscriber line (ADSL) router that provides home connectivity to an ADSL service provider (SP) network over an ADSL/ATM physical layer.Cisco 678 features Discrete Multi-Tone (DMT Issue 2) frequency modulation-based, G.Lite (G.992.2) splitterless ADSL and Carrierless Amplitude Modulation and Phase (CAP)-based ADSL physical layer. Rate adaptive DSL (DMT Issue 2 encoding) interface provides maximum receive data rates up to 8.032 Mbps and transmit data rate up to 864 Kbps. The 678 features autonegotiating 10BaseT or 100BaseTX Ethernet interface and supports ATM Forum-compliant permanent virtual circuits (PVCs). In addition, status LEDs and the support of major management protocols, in combination with supported interfaces, provide convenient operational control and management.