The Ciena NTK538FR is a WaveLogic Ai (WLAi) FOTR circuit pack for the Ciena 6500 platform. It’s a high-density 34-port module — 4x QSFP28, 14x SFP+, and 16x SFP28 — built around a programmable 400G coherent line interface.
Operators use this card where dense client-side aggregation needs to pair with flexible, software-tunable coherent transport in a single chassis slot. Available through TelecomLeasing for purchase or lease, with equipment tested before it ships.