HP J2499A 800 Series D-Class 155Mbs ATM HSC Adapter
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The HP J2499A (800 Series D‑Class ATM‑155 Mb/s HSC Adapter) is a legacy ATM (Asynchronous Transfer Mode) network interface card designed for HP 9000 PA‑RISC machines. Built in the compact HSC/GSC form factor, it delivers 155 Mb/s OC‑3c ATM connectivity, providing high‑speed packet switching suitable for vintage enterprise and telecom environments. Widely available as a refurbished OEM component, it is used to maintain or restore ATM infrastructure on legacy HP systems and typically comes with short‑term warranties from resellers