OFNP stands for Optical Fiber Nonconductive Plenum. They can be installed in ducts, plenums and other spaces used for building airflow. Common outer jacket materials are divided into PVC, riser, Plenum, LSZH, etc. Therefore, LSZH is only a material property and. While Cat8 Ethernet cable is rated for up to 40Gbps, that ecosystem is still in its infancy as fiber is already pushing to 10x that speed and beyond (see Inside a Marvell-Innovium Teralynx 7-based 32x 400GbE Switch. This is the highest fire rating fiber cable and no other cable types can be used as.