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A data center route breaks on the day the fiber contract expires, and the counterparty is free to say no.
The market underwrote long-dated fiber rights as something close to ownership, because glass lasts for decades and routes do not move.
Keep underwriting that way and you hold a campus whose connectivity carries a termination date somebody else controls.
The Money Lands After 2030
The exposure is loading up. The filings show it.
Cogent Communications reported committed additional dark fiber IRU agreements of $113.8 million as of December 31, 2025, payable over periods of up to 20 years.
Of that, $9.7 million falls due in 2026 and $4.8 million in each of the four years after.
The remaining $84.9 million falls after 2030.
Three quarters of the money lands in the decade when this buildout reaches its second lease cycle.
So, the question is where fiber value actually sits. It is moving from the strand to the corridor.
Three Assets, One Label On The Schedule
Start with the instrument. An indefeasible right of use conveys exclusive use of named strands, on a route the grantor owns, for a defined term.
Cogent’s filing for the quarter ended March 31, 2026, describes its own position: IRUs with initial terms of up to 20 years, with renewal options after the initial term.
The grantor keeps title to the cable. The grantor also keeps the permissions that let the cable sit where it sits.
Then read the renewal language, because that is where the asset is won or lost.
Cogent’s accounting disclosure splits the phrase three ways.
The option to renew may be automatic, may be at the option of the Company, or may be mutually agreed with the dark fiber provider.
Automatic means the route continues unless somebody stops it. At the holder’s option means the holder decides alone.
Mutually agreed means the holder has a right to a conversation. Three positions. One label on the schedule.
The Chain Beneath The Strand
A strand right cannot outlive what carries it.
The same Cogent filing lists rights-of-way as operating leases, held separately from the IRUs.
Separate documents. Separate clocks.
The duct has a date. So does the corridor licence, the bridge attachment, the riser and the meet-me-room agreement.
Your route ends when the shortest of them ends, and the customer never asks which one it was.
The Glass Outlasts The Paper
The industry has long assumed the binding limit on a fiber asset is the physical life of the glass.
That assumption held when cable degraded on a schedule close to the contract term. It does not hold now.
Lumen extended the estimated economic life of its owned fiber network assets to 30 years as of January 1, 2024.
The reasons it gave were the physical life it has experienced and the absence of technological change that would replace fiber.
The glass now outlasts the paper written on it. That fact is public, and it was reported as an accounting change.
The consequence was left on the table: when the asset outlives the contract, the contract becomes the constraint, and tenure sets terminal value.
Where Regulated Access Reaches
The cost shows up in time before it shows up in price. Replacement is a civil works project.
Permits, crossings, corridor congestion and crews set the calendar, and for a diverse path into a live campus that calendar runs in years.
Regulated access shortens it where regulated access reaches. Regulation (EU) 2024/1309, the Gigabit Infrastructure Act, has applied since 12 November 2025, with further provisions in February and May 2026.
It requires network operators and public bodies to meet all reasonable requests for access to physical infrastructure on fair and reasonable terms.
Ofcom published its Telecoms Access Review 2026-31 on 17 March 2026, effective 1 April 2026.
Duct and pole access stays at cost-based prices. Openreach must supply dark fibre at cost-based prices in Area 3, covering 34 percent of UK postcode sectors.
Where those regimes reach both of your endpoints, your renewal has a ceiling. Where they do not, it has none.
Norton Rose Fulbright, reviewing the Ofcom statement, noted one absence in it: any express focus on data centre connectivity.
Exit carries a price too. Cogent terminated its Spanish IRU capital lease obligations in March 2015 and obtained alternative fiber for its customers there.
It recorded an estimated termination liability of $8.1 million against $29.9 millions of remaining lease liabilities and $10.0 millions of remaining net book value.
A substitute existed, so the exit was a negotiation. Remove the substitute and the same event is a service failure.
Operators Set Tenure At Contract
Operators carry this one. Your binding variable is tenure alignment across the delivery chain. You set it at contract. You discover it at renewal.
You are selling fifteen-year capacity into campuses.
Confirm every link supporting that capacity survives fifteen years before you quote it.
The failure costs you twice. You lose the route, and you lose it on the schedule of a counterparty who knows your migration cost.
By then your optics, laterals, cross-connects and customer architecture all sit on one path.
A route that looked ordinary at signature can be the only diverse entrance into a campus twenty years later.
That is the point where your renewal stops being commercial.
The Checks That Catch It
Run six checks and run them early.
Sort every route into the three Cogent categories: automatic, at your option, or mutually agreed. That is a contract review and it belongs at diligence. The third category is an asset only through its stated term.
For every route in that category, pull the pricing language. Ask whether a renewal price can be set without the counterparty’s consent. A fixed fee, an index, a cap or an independent benchmark answer yes. “Then-prevailing market rates” answers no.
Build the expiry ladder for the whole chain: duct, corridor licence, bridge attachment, building entry, maintenance agreement. The evidence is the underlying agreements. If the seller cannot produce them, you have your answer.
Test the substitute at route level before assuming any ceiling. Confirm alternative provider coverage at both endpoints, the regulated product, and the build estimate and lead time. Ofcom’s Area 3 remedy covers 34% of UK postcode sectors, but nowhere else.
Set the notice window against that build lead time. A twelve-month notice period on a path that takes three years to replace is a formality.
Price the walk-away before you sign. Cogent put a number on leaving Spain in 2015 because a substitute existed. Know yours.
Ofcom left one question open. Regulated dark fibre now reaches a third of UK postcode sectors, but the review carried no express focus on data centre connectivity.
AI campus routes have the least diversity and highest switching costs yet sit outside the pricing remedy.
Watch whether that gap closes next cycle or gives corridor owners five more years to price it.