Speed & distance
Fiber wins, overwhelmingly. Single-mode fiber carries 100-gigabit for kilometers; copper tops out at 10-gig/100m (Cat6a) or 40-gig/30m (Cat8). Past 100 meters or past 10-gigabit, there is no copper conversation.
When light beats copper — speed, distance, cost, PoE, and the border where every modern building runs both.
Twisted-pair copper runs the last 100 meters; fiber owns everything beyond and everything faster. They are not competitors so much as neighbors with a border at 10-gigabit and 100 meters. This guide maps the border: where copper wins, where fiber takes over, and what each means for buyers and sellers of cable.
We buy data center fiber and copper together. Sell it →
Fiber wins, overwhelmingly. Single-mode fiber carries 100-gigabit for kilometers; copper tops out at 10-gig/100m (Cat6a) or 40-gig/30m (Cat8). Past 100 meters or past 10-gigabit, there is no copper conversation.
Copper wins. Cat6 cable, jacks, and 1-gig switch ports are commodities; fiber transceivers and termination cost multiples more per drop. For a thousand office drops at gigabit, copper is not close — it is the only sane choice.
Copper exclusively. Fiber carries no power — every PoE device (cameras, phones, access points, LED lighting) needs copper. The fastest-growing segment of twisted-pair demand is power delivery, which fiber cannot touch.
Fiber wins. Glass is immune to electromagnetic interference — factories, utilities, and anywhere lightning or heavy equipment rules. Copper needs shielding; fiber simply does not care.
Fiber wins. Installed single-mode fiber from the 1990s carries today’s 100-gig optics — the glass did not change, only the lasers. Copper’s ceiling is physics; fiber’s ceiling keeps moving with the transceivers.
In-building horizontal (desktops, PoE): copper. Backbone, risers, campus, data center: fiber. The modern building runs both — fiber vertically, copper horizontally. Anyone telling you one kills the other is selling something.
Multimode (OM3/OM4/OM5) — short reach (hundreds of meters), cheaper transceivers, the data-center in-building standard. Single-mode (OS2) — kilometers, the only choice for campus and carrier. Jacket colors code it: aqua/violet for OM4/OM5, yellow for single-mode. For sellers: data center teardowns yield both — pre-terminated MPO trunks and LC duplex assemblies have resale; bulk loose-tube has less. Fiber has no copper recovery value — its worth is entirely in reuse.
LC — the small-form duplex standard, most common in data centers. SC — the older square connector, still everywhere in carrier and enterprise. MPO/MTP — multi-fiber push-on, 12 or 24 fibers in one connector, the backbone of high-density data center trunks. ST — the bayonet legacy, mostly retired. Polish matters: UPC (blue, flat) vs APC (green, angled) — mating them damages both. For sellers: pre-terminated assemblies are identified by connector type on both ends (e.g. “LC-LC OM4”) — that string is the listing. Unconnectorized bulk fiber is a fraction of the value.
Horizontal to desks and PoE devices: Cat6a. Backbone, risers, and anything over 100m or 10-gig: fiber. Most commercial buildings run both.
Per drop at gigabit: no — transceivers and termination make fiber multiples more expensive. At 10-gig+ backbone or long distance: fiber is the only option, so the comparison ends.
No — fiber carries no electrical power. Every PoE device needs copper. (Hybrid fiber-power cables exist for special cases.)
Single-mode (OS2, yellow jacket): kilometers of reach, carrier and campus standard. Multimode (OM3/4/5, aqua/violet): hundreds of meters, cheaper optics, data-center standard.
Pre-terminated assemblies (MPO trunks, LC duplex) have resale value. Bulk fiber has no copper recovery — its worth is reuse only.
Jacket markings (category, footage, plenum/riser), box labels, and quantity. The jacket print is the entire specification.
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