What is armored optical cable? Structure, type and application of armored optical cable

Armored fiber optic cable is the same as armored cable. Armored Fiber Optic Cable, as the name suggests, is a kind of fiber optic cable wrapped with a layer of protective “armor”.

Structure of armored optical cable

In the design of armored optical cable, the outer tube can protect the cable from solvents and abrasion. Usually the outer sleeve is made of plastic, such as polyethylene. Between the outer sleeve and the inner sheath is armor, which is difficult to cut, bite and burn, such as steel strips and aluminum foil. The armor material can also prevent the optical cable from stretching during the cable laying process. Then there is the sheath stripping rope. Usually, the sheath stripping rope is directly under the armor and the inner sheath, which can help strip the sheath when splicing the optical cable to the connector or terminal. The inner sheath is a protective and flame-retardant material that can support the inner optical cable harness. The internal optical cable harness includes strengthening members, fillers and other structures to support the optical cable internally. Usually there is a central strengthening element to support the entire fiber optic cable. In simple terms, in an armored cable, the buffer pipe is surrounded by a layer of aramid yarn, a layer of polyethylene sheath, and a layer of corrugated steel armor. In this type, there is also a black medium-density polyethylene sheath with a sheathed peeling rope.

Type of armored cable
Armored optical cables are generally divided into indoor and outdoor types.

There are three types available: double armored, single armored, and unarmored.

Double-layer armored cables are used in shallow coastal waters, and non-armored cables are used in most cases of submarine cables. Single-layer armored cables are used for other occasions beyond these extreme conditions.

High tensile strength

High compressive strength against improper distortion

Simple structure to prevent bending damage

Save maintenance costs

Suitable for harsh environments and can prevent human damage

Armored optical cables are used in directly buried external equipment applications. In these applications, strong optical cables are required, and they need to be able to resist the bite of rodents and other animals.

This kind of optical cable has good anti-extrusion performance, which is very necessary for direct landfill. Use directly buried optical cables in areas where rodents are more harmful. Normally, there is a metal armor between the two bushings to prevent rodents from biting through the bushing.

Another application area of ​​armored fiber optic cables is in data centers, where the fiber optic cables are installed below the ground, so it is possible that the fiber optic cables may be damaged due to the extrusion of the floor. Because the armored optical cable is conductive, it must be well grounded using an appropriate method.

The armored optical cable used in outdoor applications is designed with a typical loose tube structure so that it can be directly buried in the ground.

Under normal circumstances, the armor is corrugated aluminum tape, and the outer layer is covered with a polyethylene bushing. This combination of outer sleeve and armor can protect the fiber optic cable from animal damage, and will not be damaged during the installation process of direct landfill.

The armored optical cable used in indoor applications is characterized by tightly buffered optical fibers or loose buffered optical fibers, strengthening members and internal bushings, and is covered with spirally wrapped interlocks on the outside metal tape armor.

Post time: 2021-02-19


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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