Choosing the right fiber optic cable involves more than picking single-mode or multimode. The jacket, connector, and strand configuration all need to match your installation environment and network equipment — and getting any one of them wrong can mean a cable that doesn't fit your ports, doesn't meet code, or doesn't survive the environment it's installed in.

If you're not yet sure whether you need single-mode (OS2) or multimode (OM2, OM3, OM4, or OM5) fiber, see our companion guide, Fiber Optic Cable 101: How It Works, for a breakdown of fiber types, speeds, and distances. This guide covers everything else: jacket types, connectors, strand counts, common installation mistakes, and a full checklist to run through before you order.

1. Start with your equipment and transceivers: The transceivers on each end determine the fiber type (OS2, OM2, OM3, OM4, or OM5), the connector type, and often the maximum supported distance.
2. Identify your installation pathway: Whether the cable runs through a plenum space, a riser shaft, outdoors, underground, or indoors determines the fire rating and environmental protection it needs.
3. Match your connectors: Confirm the connector type and polish required at each end of the link.
4. Determine strand count and configuration: Decide whether the link needs simplex, duplex, or multifiber cable based on the transceivers and network design.
5. Add protection as needed: Consider armor, crush resistance, rodent resistance, or tactical construction if the cable will be exposed to physical stress.
6. Measure length accurately: Account for routing, vertical runs, bends, and service loops — not just the straight-line distance between endpoints.

Plenum-Rated Cable

[Plenum-rated cable] is designed to limit flame spread and smoke generation in spaces that circulate environmental air.

Best for Environmental air-handling spaces, including certain areas above suspended ceilings or below raised floors, and pathways requiring an OFNP rating.

Plenum cable may cost more, so it may be unnecessary when the installation pathway does not require it.

Riser-Rated Cable

[Riser-rated cable] is designed for vertical pathways between floors. It is flame-resistant but does not meet the same smoke requirements as plenum cable.

Best for Riser shafts, building backbones, equipment rooms, and other non-plenum indoor pathways.

Low-Smoke Zero-Halogen Cable

[Low-smoke zero-halogen], or LSZH, cable is designed to produce limited smoke and minimal corrosive halogen gases when exposed to fire.

Best for Ships, tunnels, transportation facilities, military installations, industrial sites, and projects that specifically require LSZH construction.

LSZH does not automatically mean plenum or riser rated.

Indoor/Outdoor Cable

[Indoor/outdoor cable] combines an indoor flame rating with protection against conditions such as moisture, ultraviolet exposure, and temperature changes.

Best for Outdoor conduit, campus networks, building-to-building links, security systems, and routes that transition between outdoor and indoor environments.

The cable's exact water resistance, UV resistance, and indoor fire rating should still be confirmed before installation.

Outdoor and Direct-Burial Cable

Outdoor cable is designed to withstand moisture, sunlight, temperature changes, and other environmental exposure.

Direct-burial cable includes additional protection that allows it to be installed directly in the ground without continuous conduit.

Best for Underground pathways, exterior networks, telecommunications infrastructure, and building-to-building connections.

Not every outdoor cable is rated for direct burial or extended indoor use.

Armored Cable

Armored cable includes an additional protective layer that helps resist crushing, impacts, rodents, and other physical damage.

Best for Warehouses, industrial facilities, outdoor pathways, conduit, rodent-prone areas, and physically demanding installations.

Armor is a cable construction, not a fire rating. An armored cable may still require a separate plenum, riser, indoor/outdoor, or outdoor rating.

FCD's Armored Xtreme™ fiber optic cables provide added protection for demanding indoor and outdoor applications.

Tactical and High-Traffic Cable

Tactical fiber uses a flexible, rugged construction designed for repeated deployment, coiling, foot traffic, temporary installations, and demanding field conditions.

Best for Concerts and live events, sporting venues, broadcast production, convention centers, military field operations, and temporary industrial installations.

FCD's Trample Tough™ fiber optic cables are designed for high-traffic and frequently deployed applications.

UPC Polished with a curved, domed end face. Typically identified by a blue connector body and used in data center, LAN, and general enterprise applications.

APC Polished at an 8-degree angle to reduce back reflection. Typically identified by a green connector body and commonly required for telecom, fiber-to-the-home, and other return-loss-sensitive applications.

• Mismatched connectors: Ordering connectors that don't match the equipment prevents the link from physically connecting or forces a field re-termination.
• Mixed fiber types: Combining single-mode and multimode components on the same link can cause significant signal loss or complete failure to link up.
• Exceeding bend radius: Bending cable tighter than its minimum bend radius stresses the glass fiber internally, which can crack it or increase signal loss — sometimes without any visible damage to the jacket.
• Pulling on connectors: Pulling a cable by its connector instead of its strength members can damage the ferrule or disconnect the fiber inside, even if the jacket looks fine.
• Dirty end faces: Failing to inspect and clean connector end faces is one of the most common causes of fiber link failures — a single speck of dust can block or scatter the signal.
• Wrong environment rating: Using indoor-rated cable outdoors exposes it to moisture and UV degradation it wasn't built to handle.
• Assuming armor covers everything: Armored cable still needs its own separate plenum, riser, or outdoor rating — armor addresses physical protection, not fire code.
• Underestimating length: Measuring only the straight-line distance and skipping routing, vertical runs, or service loops often results in a cable that's too short once installed.
• Incorrect polarity: Ordering the wrong MTP/MPO polarity or pin configuration can misalign transmit and receive paths, breaking the link even though every connector appears to be seated properly.