ADTRAN Holdings, Inc. is a provider of open, disaggregated networking and communications solutions that enable voice, data, video and Internet communications across any network infrastructure. Its segments include Network Solutions, which offers hardware and software products, and Services & Support, which includes a portfolio of network design and implementation services, support services and cloud-hosted SaaS applications. The segments span across Subscriber Solutions, Access & Aggregation Solutions, and Optical Networking Solutions. Its Subscriber Solutions portfolio is used by service providers to terminate their access services infrastructure at the customer's premises. The Access & Aggregation Solutions are solutions that are used by communications service providers to connect subscribers. Its Optical Networking Solutions are used by communications service providers, Internet content providers and large enterprises to securely interconnect metro and regional networks over fiber.