英国采购需求：光纤收发器、QSFP28-LR4、SFP28 25G、SFP+ 收发器、10G 模块、25G 模块

I'm reaching out to verify the status of several items in our inventory for our obsolescence monitoring. Specifically, I'd like to confirm whether the listed modules and integrated circuits are still in production and available for purchase. Additionally, please provide any updates on potential future issues regarding these items. Your assistance with this is greatly appreciated, as it will help us maintain our inventory effectively. Thank you!