The Cisco AS535-AC-RPS is a high-density, carrier-class access server that provides high-performance voice and data services over TDM (Time Division Multiplexing) and IP (Internet Protocol) networks. It is designed for service providers and large enterprises to deliver a wide range of services such as voice over IP (VoIP), fax over IP, dial-up and ISDN access, virtual private networks (VPNs), and more. The AS535-AC-RPS supports up to 60 T1/E1 interfaces or 120 analog modem connections, making it suitable for environments with high traffic demands. It offers advanced features like integrated voice and data services, redundancy options, and support for various protocols and interfaces. Additionally, the AS535-AC-RPS can be equipped with a redundant power system (RPS) to ensure high availability and reliability. The RPS provides backup power in case of a power supply failure, minimizing downtime and ensuring uninterrupted service. Overall, the Cisco AS535-AC-RPS is a versatile and scalable access server that enables service providers and enterprises to deliver robust voice and data services to their customers.