Armored Fiber Optic Cables

Since the appearance of fiber optic cables, fiber optic communication has changed people’s life greatly. However, in reality different environments have different requirements for cables. Especially in harsh environments, ordinary cables cannot meet the requirement. Armored fiber optic cable is required. Now, in this passage, some basic information about armored fiber optic cables will be introduced. Hope it will be useful for you.


Armored fiber optic cable, wrapped a layer of protective “armor” outside of the fiber optic cable, is used primarily for protecting fiber optic cable against fire, moisture and rodent. It uses flexible stainless steel tube inside the outer jacket as the armor to protect the fiber glass inside. It is the specific jacket that can protect the fiber cable from damaging even if stepped by an adult and they are rodent-resistant. Although armored fiber optic cables are strong, they are actually as flexible as standard fiber optic patch cords; they can be bent randomly without being broken. And armored fiber patch cable can be laid directly in the equipment room, outdoor optical access and harsh environments without protective sleeve. Therefore, their space-saving and easy installation can perfect the wiring construction, reduce losses, improve life of fiber optic cables and then improve the security and stability of the entire system.


Generally, there are many standards to classify armored fiber optic cables such as environment, jacket rating, cable type, fiber type and so on. Here I’d like to introduce the first two classified methods.


According to the use of environment, there are indoor armored cables and outdoor armored cables.

There are two types of indoor armored cables — single armor and double armor fiber optic cables. A single armored indoor includes tight optical fiber, stainless steel hose, stainless steel woven wire and outer sheath. These materials bring up the unique properties of indoor armored cables. Single armor refers to the fiber cable excluding stainless steel braided wire cable; double armored fiber optic cable includes stainless steel hose and stainless steel woven wire.

Outdoor armored fiber optic cable can be divided into light armored and heavy armored. Light armored has steel and aluminum strip which is to strengthen and anti-rodent bite. Heavy armored is wrapped in a circle wire, generally used in the riverbed, submarine.

Jacket Rating

According to the jacket rating, there are riser armored fiber cable and plenum armored fiber cable.

As designated by the National Fire Protection Association (NFPA),”riser” is used for interior fiber-optic cables which contain electrically conductive components, and it is also certified for use in riser applications; this material is engineered to prevent the spread of fire from floor to floor in a building. And according to National Electric Code (NEC), a plenum is a “compartment or chamber to which one or more air ducts are connected and forms part of the air distribution system.” That is to say, as a plenum, the space above an acoustic tile ceiling would have to extend above other rooms in the same building or be open to ducts connecting it to other parts of the building. The concern is that during a fire, if there is burning material in a plenum air space, smoke and fumes can travel through air ducts to the whole building.

In a word, both the interlocked riser armored fiber cable and interlocked plenum armored fiber optic cable offer an extremely well protected cable package ideally suited for harsh environments. And it can be installed in high traffic areas where added mechanical protection and security are required.


As is mentioned above, armored fiber optic cable retains all the features of standard patch cord and has more applications. Armored fiber optic cable utilizes an interlocking armored design which eliminates the need to install rigid conduit to meet building codes. The armor provides added protection for installation in high traffic areas where security is required. It is ideal for industrial networking applications and is more flexible than corrugated steel armored cables.

Armored cables are widely applied in harsh environments and they enhance the stability and safety of the whole network. They are very popular for covering long distances, because the fibers are covered by a stainless steel flexible tube, which substantially increases the tensile strength, pressure and twist resistance. As a result, it greatly increases the yield during the installation phase and thus offers a high cost saving. These cables sustain up to 300 kilo weight which also avoids damage from trampling on the cables. Based on all the specific characteristics, armored fiber optic cables are widely applied in the fiber optic network, optical fiber CATV, fiber LAN, FTTH, military Industry and fiber optic broadband access network.


With the development of modern communication, more and more fiber optic products will come into our life. As one of the members of fiber optic products, armored fiber optic cable is an important optical component in long distance cabling network. Hope you can choose the suitable products on the basis of this article.

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