Calix Inc (Calix) develops, markets, and sells an appliance-based platform, cloud, and managed services that enable service providers to innovate and transform their businesses. Its product portfolio includes the Calix Platform, Calix Intelligent Access, and Calix Unlimited Subscriber solutions. The company also offers SmartLife managed services, including SmartHome, SmartTown, SmartBiz, SmartMDU, and ManagedBiz services.

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Calix's R&D arm focuses on designing, developing, and enhancing the platform, cloud, and managed services, performing product and quality assurance testing, and ensuring the compatibility of products with third-party hardware and software products. The company has made significant investments in its product portfolio and innovative technologies that support its business strategy. The R&D team is composed of engineers with expertise in software and cloud platforms, optics, wireless technologies, and systems engineering. Its R&D facilities are in n San Jose and Petaluma, California; Nanjing, China; Bangalore, India; Minneapolis, Minnesota; and Richardson, Texas. As of December 2024, the company had a portfolio of 114 US patents and 50 US and international patent applications. In FY2024, it incurred expenses of US$179.8 million of R&D, which as a percentage of revenue, stood at 22%.