The ADTRAN 9516 is a next-generation Ethernet Passive Optical Network (EPON) optical line terminal (OLT), supporting full 1G and 10G EPON functionality in a high-density, fully redundant, temperature-hardened platform. Built on a leading Layer-3 switch platform, the 9516 is at the forefront of PONbased access network technology. The 9516 delivers compact size, traffic management, multiple EPON modes (1G/1G, Turbo (2/1), 10G/1G, 10G/10G), and DPoE support along with other capabilities that are required by evolving access networks. With the headroom to provide expanded bandwidth and advanced feature sets, the 9516 supports the increasing deployment of FTTx networks, including fiberto-the-home, fiber-to-the-business, fiber-to-thedesk, and fiber-to-the-tower. As a scalable EPON OLT, the 9516 allows network operators to control costs and capacity with a “pay as you grow” platform. Additional blades, redundancy, line cards, and optics can be installed as needed, making the 9516 virtually future-proof. The chassis features 6 blade slots that can accommodate two switch and control units (SCUs), up to two line interface modules (LIMs), and up to 3 PON interface modules (PIMs). The LIM slots, which provide the NNI/ uplink connections, accept eight-port 1GE or 10GE blades. The PIM slots accept eight-port 1G EPON or universal EPON blades to support 1G/1G, Turbo (2/1), 10G/1G, and 10G/10G EPON, with a total capacity of 24 PONs. Additionally, non-hardened C9500 OLT blades can be used in place of temperature-hardened units when the C9516 is located in a temperature-controlled environment. For added compatibility the same software that operates the ADTRAN 9500 OLT is used to run the 9516, providing craft familiarity, accelerating feature development, and lowering overall approval and support costs. The 9516 provides convenient system operation and maintenance via Layer-2 switching; Layer-3 routing; QoS; Operations, Administration, and Maintenance (OAM); and security features. Additionally, the platform incorporates a fully redundant design that improves system availability and reliability to “five nines” levels. Together, these features provide an adaptive and powerful EPON solution that satisfies network policy and configuration requirements.