Calix, Inc. provides cloud and software platforms, systems and services required to realize the unified access network. The firm offers broadband communications access systems and software for fiber and copper-based network architectures that enable communications service providers to transform their networks and connect to their residential and business subscribers. It enables communication service providers to provide a wide range of revenue-generating services from basic voice and data to advanced broadband services over legacy and next-generation access networks. The firm focuses on communications service providers access networks with the portion of the network, which governs available bandwidth and determines the range and quality of services that can be offered to subscribers. It also develops and sells carrier-class hardware and software products. The company was founded by Michael L. Hatfield and Carl E. Russo in August 1999 and is headquartered in San Jose, CA.