The Cisco uBR905 cable access router functions at its most basic level as a cable modem - a modulator/demodulator that provides high-speed network access on the cable television system to residential and small office/home office (SOHO) subscribers. The Cisco uBR905 router uses the cable system's existing physical plant to provide Internet and other wide area network (WAN) connectivity over the service provider's Hybrid/Fiber Coax (HFC) cable system. The router is based on the Data-over-Cable Service Interface Specifications (DOCSIS), a standard developed with service providers to ensure that any DOCSIS-certified cable modem can interoperate with any bi-directional, DOCSIS-qualified CMTS. The DOCSIS standard also sets required levels of performance and reliability for the cable network.