The Ciena NTK538EJ is a 100G OTR circuit pack for the Ciena 6500 platform, built with WaveLogic 3n coherent optics tunable across Extended C-Band. A single QSFP28 port combines both client and line-side interfaces in one compact slot.
That space efficiency makes it a fit where rack space or power budget is tight. TelecomLeasing carries tested Ciena 6500 circuit packs for purchase or lease.