Wavelength Services, With the Route in Writing
A wavelength is a dedicated optical channel between two sites, lit and run by the provider. You get a fixed path without owning optical equipment. TREU finds the providers that reach both ends, compares their routes and protection, negotiates with your legal team, and is still there at the renewal.
Book a conversationWhat a Wavelength Is, and When It Fits
A wavelength service is a point-to-point optical circuit. The provider runs the equipment and hands you a channel at a fixed rate, usually 1, 10 or 100 gigabits, and 400 where the route supports it, as Ethernet or inside an OTN signal. With no packet switching in the path, latency is low and predictable. You pay a recurring charge priced by capacity, plus port charges and any construction the route needs.
When it makes sense
- A few fixed sites, such as two data centers or a headquarters and its recovery site, that need 10 gigabits or more of dedicated capacity.
- Replication, trading and other real-time traffic that needs a fixed path, with a latency estimate written into the order.
- Traffic that should not share a switched network with anyone else's.
- High capacity between sites when you do not want to buy, spare or run optical equipment.
When it does not
In our judgment, look past a wave when:
- Sites need less than about a gigabit, or many sites must reach one another. Ethernet offers finer bandwidth steps and multipoint options.
- Capacity will grow steadily for years and your team runs, or will hire for, optical operations. Dark fiber can cost less over the term.
- The date cannot move and the sites are not yet on a provider's network. Construction can add months.
If Ethernet or dark fiber is the better buy, you will hear it from us before you sign anything.
Wavelength, Ethernet or dark fiber
| Wavelength service | Ethernet private line | Dark fiber | |
|---|---|---|---|
| Latency | Low and predictable on a fixed path | Depends on the switched network and class of service | Set by your route and your optics |
| How bandwidth is sold | Fixed rates of 1, 10, 100 or 400 gigabits | Finer steps, starting in megabits | Set by the optics you install |
| Shape | Point to point | Point to point or multipoint | Point to point, on the strands you hold |
| Best fit | A few sites that need high, dedicated capacity | Many sites, or smaller capacity | Long horizons and steady growth, with your own optical team |
Technical Considerations
A wave looks simple on a quote: two addresses and a speed. These are the design points that decide whether it works on the install date and during an outage.
Matching the handoff
Each end hands off as Ethernet, at 10, 40, 100 or 400 gigabits, or as an OTN signal. Your equipment port must match the provider's interface, optics and connector, and the optics should be on site before the install date. The two ends can use different formats, but at least one provider will not protect a mixed-format circuit.
OTN and transparency
OTN wraps your signal with monitoring overhead and forward error correction, which extends reach and lets the provider watch performance end to end. For 10 gigabit Ethernet, the way the signal is mapped into OTN decides whether every bit arrives as sent. If your design depends on that, name the mapping in the order.
Protection is bought by segment
A protected wave adds a standby path on a separate fiber pair and switches to it when the working path fails. One provider sells protection for the local access only, the long-haul core only or the whole path, and others offer restoration over an alternate route instead. In that provider's SLA, each class carries its own availability standard.
Protection is not diversity
Protection is one circuit with a standby path. Diversity is two circuits on separate routes, and at least one provider bills it as two circuits plus diversity charges and will not combine the two. Diversity may begin only where the routes can first split, such as the nearest manhole outside your building, so the last stretch can still be shared.
Two carriers are not two routes
Waves from two carriers can still share a trench or a building entrance; the network family page covers how to check. Where no second entrance exists, you may have to arrange and pay for one, and a wave that crosses to another carrier may lose its protection or diversity options at the meet point.
Latency on both paths
Latency is set mostly by route length, and fiber follows rights of way, not straight lines. Regenerators and other equipment along the route add delay, so two routes of equal length can differ. The protect path can have different latency, and one provider's latency commitment covers only the working path. Ask for the estimate on both, and get it into the order.
Aggregation at the hub
A large port at a hub can collect several smaller waves, which saves ports and cross-connects. At least one provider will not protect a channelized circuit, or any circuit that connects to one, so settle protection before you design the hub.
Site readiness
The install date depends on your side too: access to the telecom room, a contact on site, conduit from the building entry to the handoff, and space and power where the provider places equipment. A room that is not ready moves activation. Keep the old circuit live until the new one is accepted.
Why a Wave Matters to IT and Finance
For IT and network leaders: capacity without the optical team
- A dedicated channel between your sites, without buying, sparing or running optical equipment.
- Protection, diversity and latency chosen on purpose and written into the order before you sign.
- Shared trenches and building entrances found before an outage finds them.
- Install dates and turn-up checks held by TREU, and renewal dates tracked, so your network team is not following up with providers.
For finance: resilience priced before you buy it
- Protection classes and diversity priced side by side, so you buy the resilience the business needs and no more.
- Port, cross-connect and construction charges visible before signature, not on the first invoice.
- Install dates, credits and exit rights negotiated while you still have a choice of provider.
How TREU Sources a Wavelength
See how we work-
Supplier identification
We find the providers that serve both ends of each wave on their own networks, and the routes each can offer, wherever your sites are. Regional, utility and municipal networks are part of the search.
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Buying cycle
We settle with you on a wave, Ethernet or dark fiber, then compare routes, protection classes, latency estimates and terms side by side. We negotiate the commercial terms alongside your counsel.
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Implementation oversight and accountability
We hold the provider to its install date, and to the handoff and latency it committed to, shown in its turn-up results. Then we check the first invoice against the contract.
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Client and supplier lifecycle management
We track terms and renewal dates, join business reviews, and source the next wave or a diverse second route when you need one. In our experience, the work starts months before the notice date, not weeks.
What to Watch For in a Wavelength Contract
A wave SLA reads well until the first cut. These are the terms we press on before signature.
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The protection class.
The availability promise depends on which segments are protected, In some SLAs, the strongest applies only when the whole path is protected. Make sure the class you buy matches the promise you were sold.
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What counts as an outage.
Often only a complete loss of service, and only once it has lasted a minimum continuous period. A degraded wave may not count at all.
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Credit caps and claims.
Credits are usually the sole remedy, capped, and paid only if a ticket was opened when the outage began and the claim arrives in writing within a set window.
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Chronic failure.
Negotiate the right to leave a circuit that keeps missing its standard without termination charges, and check how short the notice window is.
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Exclusions.
Look for the first month after installation, scheduled and emergency maintenance, delays on your side and faults on submarine cable.
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Install dates.
Install dates are often objectives with no credit for missing them, and construction can extend them by months. If the date matters, negotiate a remedy.
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The latency estimate.
Put the pre-sale estimate for both paths in the order, and ask for the right to cancel without charges if the measured delay misses it at turn-up, as at least one provider allows.
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Maintenance notice.
At least one provider promises only to try to give notice of planned work. Write the notice period and the maintenance windows into the contract.
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Diversity in writing.
If you pay for diverse routes, the contract should commit to no shared segments and say what happens when one is found.
Use this list to start your review. TREU is not a law firm. Your counsel gives the legal advice.
Questions Buyers Ask About Wavelengths
Are two waves from two carriers diverse?
Not automatically. Providers lease capacity on the same underlying fiber, and routes can meet at bridges, crossings and building entrances, so two carriers can still mean one trench. Diversity across providers has to be checked route by route, and the contract should commit to it.
Should we buy a wavelength or an Ethernet private line?
A wavelength gives you a dedicated channel on a fixed path, sold in large fixed steps. Ethernet runs over the provider's switched network, sold in finer bandwidth steps, with multipoint options. In our judgment, a wave fits a few sites that need 10 gigabits or more, and Ethernet fits many sites or smaller capacity.
Do we need a protected wavelength?
It depends on what an outage costs you. An unprotected wave has one path, so a single cut takes it down. A protected wave switches to a standby path on a separate fiber pair. One provider sells protection for only the access or only the core, and others offer restoration over an alternate route instead. If both paths fail, a protected wave is down too, which is why some buyers take two diverse waves instead.
What is the difference between protection and diversity?
Protection is one circuit with a standby path that takes over automatically. Diversity is two circuits on physically separate routes, which you can use at the same time, and at least one provider bills it as two circuits plus diversity charges. Neither is worth much if the routes share a conduit, a riser or a building entrance, so we check that before you sign.
Should we take an OTN or an Ethernet handoff?
An Ethernet handoff connects straight to your routers and switches. OTN adds performance monitoring across the whole path and forward error correction, and can carry other signal types. The right choice depends on your equipment and what you will carry over the wave. Either way, match your optics to the provider's interface before the install date, and if 10 gigabit Ethernet must arrive bit for bit, specify how it is mapped into OTN.
Can we get 400G?
It depends on the route. Published rates usually include 1, 10 and 100 gigabits, and several providers now sell 400, but availability varies by provider and route. We find out which providers can deliver it between your sites.
What latency should we expect, and can it be guaranteed?
Latency is set mostly by the length of the route, which runs longer than the straight line between your sites, plus the equipment along it. At least one provider will commit to a round-trip delay based on a design estimate made before the sale. Get that estimate into the order for both the working and the protect path, and, where the provider allows it, the right to cancel if the measured figure misses it at turn-up.
How long does a wavelength take to install?
Plan in months, and longer where the provider must build to either site. Install dates are often objectives rather than commitments, so if the date matters, ask early whether both ends are on the provider's network and negotiate a remedy for a missed date. Your own site readiness counts too.