Armored cable (just as its name implies, wrapped a layer of protective “armor” outside of the fiber optic cable) is mainly used for protecting fiber optic cable against rodent, moisture and other requirements. In the design of armored fiber optic cable, the outer sleeve which is usually made of plastic, such as polyethylene, provides protection against solvents, abrasion and etc. The next layer between the sleeve and the inner jacket is an armoring layer of materials that are quite difficult to cut, chew, and burn. In addition, this armoring material also prevent the fiber cable being stretched during cable installation. Ripcords are usually provided directly which under the armoring and the inner sleeve to aid in stripping the layer for splicing the cable to connectors or terminators. The inner jacket is a protective and flame retardant material to support the inner fiber cable bundle. The inner fiber cable bundle includes strength members, fillers and other structures to support the fibers inside. There are usually a central strength member to support the whole fiber cable.
Armored fiber cable can be used for indoor applications and outdoor applications. An armored cable typically has two jackets. The inner jacket is surrounded by the armor and the outer jacket or sheath surrounds the armor.
An armored cable used for outdoor application, is typically a loose tube construction designed for direct burial applications. The armor is generally a corrugated aluminum tape surrounded by an outer polyethylene jacket. This armor is generally a corrugated aluminum tape surrounded by an outer polyethylene jacket. This combination of outer jacket and armor protects the optical fibers from gnawing animals and the damage that can occur during direct burial installations.
Armored cable used for indoor applications may feature tight- buffered or loose-buffered optical fibers, strengths members, and an inner jacket. The inner jacket is commonly surrounded by a spirally wrapped interlocking metal tap armor. This type of armor is rugged and provides crush resistance. These cables are used in heavy traffic areas and installations that require extra protection, including protection from rodents.
When you are going to terminating your owm fiber, should know that:
Indoor interlocking fiber has a 900 size buffer, the loose tube has a smaller size 250. The loose tube smaller size benefits the manufacturers in the making the cables. The smaller size allows for an overall smaller diameter of the tube inside the cable, this goes a long way in higher strand count cables, especially considering you only get 12 strands of fiber per tube. If you are going to terminate a “loose tube” fiber cable don’t forget you need fan out kits, which can builds your 250 size to a 900 and also adds strength and durability to that 250 size.