Calix, Inc. provides broadband communications access systems and software for fiber and copper-based network architectures that enable communications service providers (CSPs) to connect to their residential and business subscribers in North America. Its Unified Access portfolio consists of main platforms and/or nodes, the B6 Ethernet service access nodes, the C7 multiservice, multiprotocol access platform, the E-Series Ethernet service access platforms and nodes, and the BLM1500 gigabit passive optical network access terminal. The company's platforms, nodes, and terminals also include P-Series and T-Series optical network terminals and residential gateways, and the Calix Management System, Entriview element management software, and Compass suite of value-added software applications. Its portfolio serves the CSP network from the central office or data center to the subscriber premises and enables CSPs to deliver both basic voice and data and advanced broadband services over legacy and next-generation access networks. The company markets its access systems and software to communication service providers primarily in North America, the Caribbean, and Latin America through its direct sales force and resellers. The company was founded in 1999 and is headquartered in Petaluma, California.