Systems and methods for transmitting signals according to service flows are described herein. In one exemplary embodiment, a routing device, such a cable modem, comprises memory configured to store a configuration file. The cable modem also comprises a network port and a plurality of input ports. The network port is configured to communicate with a cable network via a cable modem termination system (CMTS). The input ports are each configured to communicate with a communication device. The configuration file includes logic for defining a service flow for data transmission on the network port based on one or more input ports.