ADTRAN is a networking equipment and software company that sells fiber-based broadband infrastructure to telecom service providers, utilities, municipalities, and enterprises. ADTRAN's product portfolio spans the full network from optical transport to the customer's home or business, organized into three categories: Optical Networking Solutions (equipment and software for interconnecting metro and regional fiber networks), Access & Aggregation Solutions (the core fiber-to-the-home infrastructure, including optical line terminals), and Subscriber Solutions (customer premises equipment like residential gateways, ONTs, and Wi-Fi access points). ADTRAN also offers network design, implementation, and maintenance services, plus a cloud-hosted SaaS platform called Mosaic One for AI-driven network management. The core revenue model is equipment sales to service providers, which tends to be lumpy as large customers order in bulk around capital budgeting cycles. ADTRAN's growth strategy centers on several tailwinds: European carriers displacing Huawei equipment (which ADTRAN sees as its primary near-term opportunity), ongoing fiber-to-the-home buildouts in the U.S. and Europe, rising demand for optical transport capacity, and cross-selling optical and fiber access products to the same customers — a key rationale behind ADTRAN's 2022 merger with ADVA Optical Networking. ADTRAN sells primarily through a direct sales force for major accounts, supplemented by distributors for smaller customers, and maintains a majority stake in the German-listed Adtran Networks entity.