Cable Jacket is the most out layer to protect the fiber, it consists of different material based on different applications. For most of the data center MPO MTP Cable Jacket with the following three types of Jacket ratings.

• OFNP (Optical Fiber Nonconductive Plenum)
• OFNR (Optical Fiber Nonconductive Riser)
• LSZH (Low Smoke Zero Halogen)

OFNP (Optical Fiber Nonconductive Plenum)

OFNP (optical fiber nonconductive plenum) are used in plenum applications. They are used inside buildings in plenum areas, the areas between a ceiling and the floor above it, where space is reserved for the circulation of air. They have the highest rated fire retardant where it emits little smoke during combustion. The nonconductive element within OFNP means they contain no electrically conductive components.

OFNR (Optical Fiber Nonconductive Riser)
OFNR (optical fiber, nonconductive riser) are used in riser applications. These are spaces inside a building in pathways that pass between floors, such as a vertical zone or space. They are engineered to prevent fire from spreading from floors to floors within buildings.

LSZH (Low Smoke Zeor Halogen)
LSZH (low smoke zero halogen), or with variant name called LSHF (Low Smoke Halogen Free) and LS0H Cable (Low Smoke 0 (zero) Halogen). The LSZH Cables is manufactured from thermoplastic compounds, it emits very little smoke when burnt, beside it Low Smoke Zero Halogen cable is that they are much lighter to work with and are more environmentally friendly.