Outdoor and Armored Fiber Cable Guide

Outdoor and armored fiber cables answer two different threats, and a buyer should not confuse them. An outdoor cable resists weather: rain, sun, temperature swings and moisture over years of exposure. An armored cable resists physical damage: crushing, gnawing, digging and impact. Some cables are both, some are one or the other, and the installation environment decides which is needed. This guide covers both at category level.

An outdoor cable starts with its jacket. The jacket material resists ultraviolet light, so it does not crack and degrade in sunlight, and it resists moisture, so water does not reach the fibers inside. Water blocking is the second layer: a gel, a tape or a dry compound inside the cable that stops water travelling along the cable if the jacket is breached. The published CPRI cable SM 60m on this site states full water blocking rated IP67, a moisture-resistant loose tube and crush resistance, which is the outdoor construction pattern in full: a jacket, a water block and a loose tube that lets the fibers move without strain.

An armored cable adds a metal layer — corrugated steel tape, steel wire or a similar armour — between the jacket and the core. The armour resists crushing, for example where a cable runs under a floor, through a duct shared with heavier cables, or across a site where vehicles pass. It resists gnawing, where rodents are a problem. It resists the accidental shovel, though no armour resists a deliberate dig. The trade-off is weight, stiffness and cost: an armored cable is heavier, harder to bend and more expensive than an unarmored cable of the same fiber count, and it needs proper grounding where the armour is conductive.

Which does an installation need? A cable on a tower, a rooftop or an external wall needs outdoor construction, because weather is the threat. A cable buried directly, without a duct, needs armour, because crushing and gnawing are the threats. A cable in a duct outdoors needs outdoor construction, and armour only if the duct is shared or shallow. A cable indoors needs neither, and paying for either wastes budget. A buyer should describe the route — outdoor or indoor, ducted or direct-buried, shared or dedicated — during the inquiry, so the construction can be confirmed for that route.

This guide states cable practice at category level. No outdoor or armored cable model, jacket specification or rating is stated here as a product claim beyond the characteristics published for the CPRI cable SM 60m on its detail page. Before ordering, confirm quantity, price and delivery time during the inquiry. Certificates are available upon request.