Dedicated Internet Access for Businesses

Dedicated Internet Access — almost always shortened to DIA — is an internet connection where the capacity you purchase is provisioned for your organization alone. On a shared broadband service (coax cable or GPON-based 'business fiber'), your traffic rides a segment with dozens or hundreds of other customers, and the speed printed on your invoice is an 'up to' number that assumes that sharing works in your favor. On a DIA circuit, there is no sharing of the access capacity: 500 Mbps means 500 Mbps, in both directions, at 3 a.m. and at 3 p.m. on a Tuesday.

The second defining feature is the service-level agreement. DIA contracts include a written SLA that commits the carrier to measurable performance — typically an uptime percentage, maximum latency and packet-loss figures, and a mean-time-to-repair commitment — with service credits if they miss. Shared broadband almost never offers this. The SLA is what turns internet from a best-effort utility into infrastructure you can plan around, and it's a large part of what you're paying for.

DIA is delivered over fiber in the vast majority of cases today. Historically it also came over T1/T3 lines and Ethernet-over-copper, but fiber is the standard medium, and modern DIA is essentially always symmetrical: a 1 Gbps DIA circuit gives you a gigabit up and a gigabit down. That symmetry matters more every year, because business traffic has flipped from mostly-download (browsing, streaming) to heavily two-way (video conferencing, cloud applications, off-site backup, VoIP).

A useful mental model: broadband is like a toll road with carpool lanes that clog at rush hour — cheap to use, but your arrival time is not guaranteed. DIA is a private lane with a contracted travel time. Most businesses don't need the private lane. The ones that do, really do.

A circuit provisioned for you, end to end

When a carrier provisions DIA, they allocate capacity on their network specifically for your circuit, from your building's entry point back to their core. The 'dedicated' part refers to the access portion — the last mile and the first aggregation layers — where shared services create contention. Your traffic eventually merges into the carrier's backbone (everyone's does; that's what the internet is), but it's engineered so that the access link itself is never the bottleneck and the backbone is provisioned to honor the SLA.

Physically, the carrier delivers a fiber handoff to a demarcation point in your building — usually an Ethernet handoff (RJ45 copper or an optical SFP) that plugs into your router or firewall. You typically receive a block of static, routable IP addresses as part of the service, and you announce or use them however your network requires. The carrier's responsibility ends at the demarc; everything past it — routing, firewall, Wi-Fi, switching — is yours.

Symmetrical bandwidth and why it changes behavior

Shared cable broadband might advertise 1 Gbps down with 35 Mbps up. DIA at 500 Mbps gives you 500 Mbps in each direction simultaneously. Businesses feel this in places they don't expect: off-site backups that finish overnight instead of running into the next workday, video conferences that stay sharp while the design team syncs large files, and cloud phone systems where every call is an upload stream. Symmetry removes the upload ceiling that quietly caps what a growing office can do.

The SLA is the product

A DIA SLA typically commits to several measurable targets. Uptime is expressed as a percentage — 99.9% allows roughly 8.7 hours of downtime per year; 99.99% allows about 53 minutes. Latency and packet loss commitments define performance quality between your site and the carrier's backbone or between regions. Mean time to repair (MTTR) commits the carrier to restoring service within a stated window, often four hours, around the clock — not 'next business day.'

Read the remedy clause, because that's where SLAs differ most. Missed targets usually trigger service credits — a percentage of the month's bill — rather than damages. Credits won't cover the revenue you lose in an outage, but they do two things: they put the carrier's money behind the promise, and they give you a documented record that matters when it's time to renegotiate or escalate. An SLA with no teeth is marketing.

How DIA differs from 'business fiber'

This distinction trips up many buyers, partly because carrier marketing blurs it on purpose. 'Business fiber' or 'fiber broadband' is usually a shared GPON service over fiber — fast, often symmetrical or near-symmetrical, excellent value — but oversubscribed and best-effort, with no meaningful SLA. DIA is a different product that happens to use the same physical medium. If a quote doesn't include an SLA document with uptime, latency, and repair commitments, you are not looking at DIA, no matter what the order form calls it.

• Peak-hour congestion: shared segments slow down exactly when your business is busiest — DIA removes contention as a variable
• Unpredictable application performance: cloud ERP, VoIP, and video behave consistently when bandwidth and latency are guaranteed
• Upload ceilings: symmetrical circuits end the nightly-backup-runs-into-morning problem and keep video calls clean under load
• No recourse on bad service: the SLA converts 'sorry about the outage' into contractual commitments with credits
• Slow repairs: a 4-hour MTTR commitment beats a broadband repair ticket that waits for the next available field tech
• Scaling pain: DIA circuits are designed to be upgraded in defined increments, often via a config change rather than a rebuild

Notice what DIA does not solve: it is still one circuit, in one conduit, from one carrier. A backhoe does not respect your SLA. Businesses that buy DIA for uptime should almost always pair it with a diverse backup path — a second carrier, a different medium like fixed wireless or 5G, or an SD-WAN overlay that fails over automatically. The guarantee covers the carrier's network behavior; physical cuts and facility failures are a design problem, not a contract problem.

The honest test is arithmetic: what does an hour of degraded or dead internet cost this business? If the answer is a rounding error, broadband is fine. If the answer is real money — a medical practice that can't pull charts, a logistics operation whose warehouse management system goes dark, a 60-person office that bills by the hour and spends the day in cloud apps and video calls — DIA starts paying for itself quickly.

Specific profiles where DIA is the default answer: offices of roughly 25+ knowledge workers running VoIP and video conferencing all day; healthcare organizations with imaging, EHR, and uptime expectations driven by a broader HIPAA security program; financial-services and legal firms where client-facing systems must be reachable; multi-site companies that need consistent, measurable performance for SD-WAN; and any business that has already been burned — two or three painful outages on shared broadband usually ends the debate.

Just as important is who should not buy it. A five-person office doing email, web, and light SaaS will not feel the difference between DIA and good business fiber — they'll only feel the invoice. Small retail sites are usually better served by affordable broadband plus a cellular failover. DIA is a scalpel for a specific problem: performance you can contract, not a status symbol.

1. Headquarters connectivity: a primary symmetrical circuit sized for voice, video, and cloud workloads, with headroom for growth
2. VoIP and UCaaS quality: guaranteed bandwidth and latency commitments keep call quality consistent — jitter and congestion kill cloud phone systems on shared broadband
3. SD-WAN underlay: DIA circuits as the high-quality transport layer under an SD-WAN overlay, often mixed with cheaper broadband at smaller sites
4. Cloud and data-center on-ramps: predictable latency to hosted applications, colocation facilities, and cloud regions
5. Compliance-sensitive environments: organizations whose broader HIPAA or financial-security programs require documented, monitored connectivity controls
6. High-availability pairs: DIA as the primary path with a diverse secondary (broadband, fixed wireless, or a second DIA carrier) behind automatic failover
7. Data-heavy operations: off-site replication, large-file transfer, medical imaging, and media production where symmetrical throughput is the product

DIA costs several times more than shared broadband at the same speed tier — that's the price of uncontended capacity plus an SLA. Exact pricing varies by address, carrier, speed, and term, and anyone quoting you a firm number before a serviceability check is guessing. That said, the levers that move the price are consistent:

• Bandwidth: the biggest driver; 100 Mbps, 500 Mbps, 1 Gbps, and 10 Gbps are common tiers with meaningful jumps between them
• Building status: 'on-net' buildings (fiber already present or lit) are dramatically cheaper than buildings requiring new construction
• Construction: if fiber must be built to your building, costs range from waived (under promotional build programs or multi-year terms) to significant one-time charges, depending on distance and permitting
• Term length: 36-month terms price better than 12-month or month-to-month, which carriers often won't offer on DIA at all
• Location: metro areas with multiple competing fiber carriers price far better than single-carrier or rural addresses
• Add-ons: managed router, DDoS mitigation, additional IP blocks, and diverse-entrance construction all add to the monthly figure

Two pricing realities worth knowing. First, the on-net/off-net gap is enormous — the same circuit can differ by a factor of two or more depending on whether your building is already lit, which is why the very first step in any DIA project is a serviceability check across carriers. Second, DIA pricing has been on a long downward trend per megabit in competitive markets; if you're three years into a legacy circuit, re-quoting at renewal often surfaces meaningfully better economics, either with your incumbent or a competitor.

Compare total cost of ownership, not the sticker. A cheap broadband line that costs you four hours of outage per quarter can be more expensive than DIA once you price the downtime — and a DIA circuit with an unmanaged failover gap has the same problem wearing a nicer suit.

A DIA order follows a predictable sequence, and knowing it removes most of the anxiety:

1. Serviceability check: verify which carriers are on-net or near-net at your address — this determines the realistic candidate list and the construction question
2. Quoting: collect quotes with real construction costs, SLA documents, and post-term pricing from the carriers that can actually serve you
3. Contract and order: sign the service agreement and SLA; the carrier issues circuit IDs and the order enters engineering
4. Site survey and construction: a field survey confirms the fiber path, entry point, and demarc location; any required construction happens here
5. Equipment and handoff: the carrier installs terminating equipment and delivers an Ethernet handoff at the demarc
6. Turn-up and testing: the circuit is activated and tested against the committed bandwidth — verify throughput yourself before accepting
7. Cutover: your firewall or router moves to the new circuit; DNS, VPNs, and any IP-dependent services are updated

The steps that slip are almost always construction-related: landlord access approvals, permits, and conduit work. A named site contact with authority to grant building access, and early landlord notification, prevent most delays. This is also where an advisor earns their keep — keeping the carrier's project manager, your landlord, and your IT resource moving on the same calendar.

Timelines vary by building status more than by carrier. For an on-net building where fiber and equipment are already in place, DIA can be delivered in roughly two to six weeks — essentially the time to provision, ship equipment, and schedule turn-up. For a near-net building with fiber in the street, expect the survey-plus-short-build path: often 45 to 90 days. For an off-net building requiring meaningful construction, 90 to 180 days is realistic, and permitting (railroad crossings, municipal right-of-way, historical districts) can push it further.

Plan around the long pole. If your lease is ending, your current circuit renews in 60 days, or an office opens on a fixed date, start the DIA conversation at least four to six months early. If construction turns out to be short, early delivery costs you nothing. If it's long, early starts are the only fix. Interim connectivity — business broadband or 5G — can bridge a gap so a move-in date doesn't depend on a permit office.

• Confusing shared 'business fiber' with DIA — if there's no SLA document, it isn't DIA
• Buying DIA as a single point of failure: one circuit, one conduit, one carrier — always design the backup path at the same time
• Sizing for today: circuits typically live for three years; buy headroom or confirm mid-term upgrade pricing in writing
• Ignoring the remedy clause: an SLA without meaningful credits, or with an onerous claims process, is a promise you can't collect on
• Skipping the on-net check across carriers: the price difference between a lit building and a new build is too large to leave to one quote
• Letting auto-renewal roll a legacy circuit at legacy prices — calendar the renewal window 90 days out
• Accepting turn-up without independent speed and latency testing at the demarc

1. Is this circuit dedicated or shared, and where exactly does the dedicated portion end?
2. Send me the actual SLA document: what are the uptime, latency, packet-loss, and MTTR commitments, and what are the credits for missing them?
3. Is my building on-net, near-net, or off-net — and is any construction cost capped or waived in writing?
4. What does this cost at 12, 24, and 36 months, and what happens to pricing at term end?
5. How do I upgrade bandwidth mid-term, and at what pricing?
6. What is the physical path into my building, and can you provide a diverse entrance for a second circuit?
7. What's included: static IP block size, managed router options, DDoS mitigation?
8. How are SLA claims filed, and what did your actual network availability look like over the past year?
9. If I have a problem at 2 a.m., who answers — a network operations center or a voicemail tree?

DIA sits at the top of a spectrum of connectivity products, and the right answer for most businesses is a deliberate position on that spectrum — often different answers for different sites. The comparison that matters:

Two patterns recur in well-designed networks. The first is hybrid by site: DIA at the headquarters and critical sites, shared fiber or broadband at small branches, cellular failover almost everywhere — with SD-WAN stitching it together. The second is hybrid by design: DIA paired with a deliberately diverse second path, so the SLA-backed circuit handles performance and the backup handles physics. Buying DIA and calling the redundancy question answered is the most common expensive mistake in this category.

Healthcare

A medical practice's connectivity now carries EHR access, imaging transfers, telehealth visits, e-prescribing, and cloud scheduling — all day, every day. DIA's consistent latency and symmetrical upload keep imaging and telehealth usable under load, and the SLA provides documented performance commitments that may support controls used within a broader HIPAA security program. Practices typically pair DIA at the main clinic with cellular or broadband failover so a cut cable doesn't cancel an afternoon of patients.

Financial services

Advisory firms, insurance agencies, and regional financial offices run client-facing systems where reachability and responsiveness are reputational. DIA gives them measurable uptime and a repair clock, plus the static IP stability that IP-restricted vendor platforms and VPN concentrators often require. Documented SLAs also simplify vendor-diligence questionnaires, which increasingly ask how core infrastructure is supported.

Logistics

Warehouses and distribution operations live in their WMS and TMS; scanners, label printers, and carrier integrations all stop when connectivity degrades. DIA at distribution sites keeps transactional latency flat through shift peaks, and symmetrical upload handles the constant telemetry flow. Operations with multiple facilities commonly run DIA at hubs and cheaper circuits at smaller depots under one SD-WAN fabric.

Manufacturing

Plants increasingly depend on cloud ERP, real-time production dashboards, and IoT telemetry, often from locations at the edge of carrier footprints where fiber options are limited. Where DIA is serviceable, it converts plant connectivity from an operational risk into contracted infrastructure; where it isn't, the serviceability check itself is valuable — it tells you whether a build program, a different carrier, or a fixed-wireless-plus-SD-WAN design is the realistic path.

Dedicated internet is a category where the buying process matters as much as the product. The same circuit at the same address can vary dramatically in price and construction cost between carriers, and the difference between on-net and off-net can double the monthly bill. TechSellers International is a technology advisor, not a carrier — we check serviceability across providers at your exact address, so you compare available options on facts rather than coverage maps.

We work with leading technology providers — national carriers, regional fiber operators, and aggregators — and quote real pricing: construction costs in writing, SLA documents you can actually compare, term pricing, and post-term behavior. We manage the order through survey, construction, and turn-up, and we stay in the account after activation — including the renewal conversation three years later, when re-quoting usually finds money.

Because we're paid by the providers, the advice doesn't add a line to your bill. You get an advocate who has seen hundreds of these contracts, knows where the clauses hide, and answers the phone when the circuit blinks — at no cost to you.