Data center fiber connectivity: what site selection should check
Data center fiber connectivity is the check that site searches tend to run second and regret running late. Power decides whether a parcel can become a project. Fiber decides whether the compute inside it can reach anyone. The strongest sites pair energized utility service with more than one path out.
This note covers what to look for in a site’s connectivity, and how the Front Range fits.
Why fiber belongs early in site selection
Fiber is part of the site, not an item to order after closing. A new lateral to a building can mean easements, permits, rights-of-way, and construction on a schedule the developer does not fully control. A site with routes already at the property line is a shorter path to a running facility.
Colocation customers, AI tenants, and lenders all ask how traffic leaves the building, on how many paths, and with whom. “There is fiber along the road” describes a neighborhood. A strong site answers for the building.
Diverse paths, separate entries
Redundancy in fiber is physical before it is contractual. Two circuits from two carriers can still share one conduit, one bridge crossing, or one trench down the same road. The useful test is route diversity: paths that leave the property in different directions, stay apart for as far as anyone can document, and reach different points on the wider network.
The same logic applies at the building. Physically separate entry points, on different sides of the structure where possible, keep one excavation or one damaged vault from cutting every path at once. Ask for route maps or route descriptions, not only a count of carriers. Two names on a list are not two paths.
Who owns the conduit
Ownership decides who can pull new fiber later, and on what terms. Conduit the site controls is a different position from conduit one carrier owns. The best case is conduit and laterals that a second or third provider can use without a new dig.
Carrier neutrality and why colocation buyers care
A carrier-neutral facility lets customers buy connectivity from more than one provider and change providers without moving their equipment. For colocation, that is close to a requirement. Tenants want to choose their own carriers, negotiate their own terms, and add a second provider when the first is not enough.
Neutrality is designed, not declared. A meet-me room where providers can cross-connect, and space for more than one carrier’s equipment, is what turns “fiber on site” into a choice for the tenant.
Long-haul, metro, dark, and lit
Long-haul fiber connects cities, usually along highway and rail corridors. Metro fiber connects buildings inside a region to each other, to carrier hotels, and to internet exchange points (IX). A site near a long-haul corridor has national reach close at hand. A metro path completes the picture by reaching the local exchange, the cloud on-ramps, and the carriers that sell in that market.
Dark fiber and lit services are different products. Dark fiber is glass the customer lights with its own equipment, which gives control over capacity and upgrades. Lit services, such as wavelengths, Ethernet, or IP transit, are capacity a provider operates and sells. Large tenants often want dark fiber between their own sites and lit services for everything else. Both are reasonable, and the best sites offer both.
AI training, inference, and latency
Not every workload weighs distance the same way. AI training jobs run for long stretches inside one cluster. Most of the latency that matters is inside the building, between accelerators. What training needs from outside is bandwidth to move datasets and checkpoints, and reliability so a long job is not interrupted. It is generally tolerant of distance from end users.
Inference is closer to the user. A model answering requests in real time feels every extra hop, so inference placement tends to weigh proximity to users and to major interconnection points more heavily. That is the general shape, not a rule for every model. Name the workload before judging the location. An inland site suits training, batch work, isolated testing, and regional users well, and coast-sensitive serving is a different question.
What a strong fiber site offers
- More than one carrier able to serve the building.
- Physically diverse paths that enter the building separately.
- Conduit that is open to additional providers without a new dig.
- Dark fiber and lit services both available.
- A direct route to the regional internet exchange and the nearest carrier hotel.
- A carrier-neutral design with room for a meet-me room.
A site that can describe each of these plainly is easy to underwrite.
Fiber and the Front Range
Denver connectivity is anchored in the metro, where carriers and interconnection already concentrate. Long-haul routes in the West follow corridors, and Interstate 25 is one of them, so a Front Range site along that corridor sits close to that infrastructure.
Inland latency is physics for coast-sensitive users. For regional users and for training, batch, and isolated workloads, diverse paths into a building that already has power are what count.
Front Range Compute in Larkspur
Front Range Compute is a site being developed by Frost River Capital LLC in Larkspur, Colorado, about 30 minutes south of Denver off I-25. Two diverse 100 Gbps fiber paths are available from Comcast, with additional carriers available. The site has about 3 MW of energized utility service from CORE Electric at 480V, outside Xcel’s data-center tariff, and supports roughly 2–2.5 MW of IT depending on cooling and redundancy design. Powered land is the first offer, with build-to-suit colocation second.
Putting fiber on the list
Count paths, not carrier names. Ask who owns the conduit, where the paths enter, and whether the building is open to more than one provider. Then put fiber next to power, cooling, staff, and land on the same list.
Fiber connectivity is diverse glass into the building. For a one-page view of Front Range Compute, start at the site overview, request the spec sheet, or write rob@frostrivercapital.com.