All carriers
National carrier
Comcast Business
Dedicated internet over fiber and coax across a 39-state footprint, with a 99.99% availability SLA. We quote it on nearly every address it serves, next to every other carrier in the building.
The short answer
Comcast Business sells two different internet products under one name. Business broadband is shared, asymmetrical and best effort. Dedicated Internet (DI) is an unshared, symmetrical circuit with a 99.99% availability SLA, delivered over coax at up to 300 Mbps or over fiber at up to 400 Gbps in select areas. On a 36-month term, DI typically runs $375 to $450 a month at 100 Mbps and $800 to $1,000 at 1 Gbps, and installs in about twelve weeks.
Speeds
10 Mbps to 400 Gbps symmetrical (up to 300 Mbps on coax)
1 Gbps monthly
$800 to $1,000 on a 36-month term
Install interval
About 12 weeks typical; faster where already on-net
SLA
99.99% availability, credits up to 50% of the monthly charge
Carrier overview
What Comcast Business offers
Comcast Business Dedicated Internet (formerly Ethernet Dedicated Internet, or EDI) is a direct, unshared connection with symmetrical speeds: up to 300 Mbps over hybrid fiber-coax, and up to 400 Gbps over fiber in select areas. Each circuit includes up to two static IP addresses and primary and secondary DNS hosting. BGP routing, larger IP blocks, managed router and firewall, DDoS mitigation and Wireless Connect cellular backup are available as add-ons, and the same account can carry Ethernet transport, SD-WAN and voice.
Separately, Comcast sells business broadband over the same coax plant: shared plans from 300 Mbps to 2 Gbps download, with upload at a fraction of that and no availability SLA. It is a good product for what it is. It is not the same product as DI, and the price gap between them is the most common source of confusion we see on Comcast quotes.
Where they are strongest
Comcast's coax reaches almost every commercial address in its 39-state territory, including suburban office parks, retail strips and light-industrial sites that fiber carriers have never built to. That makes coax DI the fastest, cheapest primary circuit for smaller sites, and one of the most useful diverse paths behind fiber from another carrier, since a cable plant often reaches the building on different infrastructure than a competitor's fiber. At 100 Mbps, Comcast DI usually prices below the market average.
The fiber DI product has matured into a legitimate enterprise offering with a real SLA and a published credit schedule, and Comcast is one of the few large carriers that posts its full dedicated service terms online.
How we quote them
We quote Comcast on nearly every address in its footprint: coax DI or business broadband for retail and branch sites, fiber DI where they are lit, and coax as the low-cost diverse path in most redundancy designs we put together.
Before a Comcast quote goes next to anyone else's, we confirm three things:
Fiber or coax. A 200 Mbps coax circuit and a 200 Mbps fiber circuit look identical on a quote. The coax circuit tops out at 300 Mbps; the fiber circuit can be upgraded without a new build.
On-net or off-net. Comcast's early termination terms are stricter on off-net circuits, so we make sure you know which one you are signing.
Shared path with your primary. If Comcast is the backup, we check that it does not enter the building through the same conduit as the fiber it is backing up.
Services we quote
Dedicated Internet · Ethernet · Business broadband (HFC) · SD-WAN · Managed router and firewall · DDoS mitigation · Voice
Coverage
39 states; strongest in the Northeast, Mid-Atlantic, Midwest and West Coast
Carrier type
National
Carrier-neutral: we work for you, our client, with no carrier or service provider bias.
Product comparison
Comcast Dedicated Internet vs Comcast Business Internet
Dedicated Internet (DI) | Business Internet (broadband) | |
|---|---|---|
Bandwidth | Reserved for your site | Shared with other customers on the node |
Speeds | Symmetrical, up to 300 Mbps on coax, up to 400 Gbps on fiber | Up to 2 Gbps download, much lower upload |
SLA | 99.99% availability, with service credits | No availability SLA |
Static IPs | Up to two included | Paid add-on |
Typical term | 36 or 60 months (12 is the default if none is set) | 1-year agreement or 5-year price lock |
Typical monthly, 1 Gbps | $800 to $1,000 | Roughly $150 to $190 (Gigabit Extra, up to 1.25 Gbps), as advertised |
Install | About 12 weeks typical | Usually much faster where coax is already in the building |
If the office stops working when the internet slows down, you are a DI customer. If the site can tolerate the occasional slow afternoon, broadband is usually the right money. We go deeper in Comcast Dedicated Internet vs Business Internet.
Alternatives
When another carrier fits better
We quote Comcast often, and we also tell clients when it is not the right pick. The usual cases:
Gigabit or faster where another cable carrier is on-net. Spectrum Business usually prices its on-net gigabit below Comcast's. Their footprints rarely overlap, but where they do, put them side by side. See Comcast Business vs Spectrum Business for dedicated internet.
You need 100% availability language in writing. Spectrum publishes a 100% uptime SLA on Dedicated Fiber Internet, and Verizon Business publishes a 100% network availability SLA on Internet Dedicated. Comcast's is 99.99%. Read the credit schedules, not just the percentages.
Sites outside the 39-state footprint, or international. AT&T Business, Lumen and Verizon cover more of the map on one contract.
A hard move-in date. A fiber carrier already lit in the building usually beats a twelve-week Comcast build. In the New York metro and New Jersey, Lightpath and Verizon are often on-net in the same buildings.
Anything above 300 Mbps where Comcast only has coax. The coax DI ceiling is fixed. If you expect to grow past it, start on fiber, from Comcast or anyone else. See Fiber vs coax dedicated internet.
Typical pricing
What dedicated internet usually costs here
Below the market average at 100 Mbps and in line with it at 1 Gbps, delivered over Comcast's own fiber and hybrid fiber-coax plant. Typical dedicated install is about twelve weeks.
| Tier | Typical monthly | Market average |
|---|---|---|
| 100 Mbps | $375 – $450 | ≈ $500 |
| 1 Gbps | $800 – $1,000 | ≈ $900 |
Contract notes
What the Comcast Dedicated Internet contract actually says
Comcast publishes its Dedicated Internet terms. These are the clauses we walk every client through before they sign, from the enterprise Dedicated Internet product-specific attachment (version 116, 2026):
Default term. If the order does not specify a term, it is 12 months. We usually quote 36 and 60, because the monthly rate drops with term.
Early termination, on-net. If you cancel after service starts, you owe 100% of the remaining monthly charges in months 1 to 12, 80% in months 13 to 24, and 65% from month 25 to the end of the term, plus any unpaid custom installation fees.
Early termination, off-net. 100% of the remaining monthly charges, plus unpaid custom installation fees, plus any third-party termination costs.
Cancelling before install. You owe the installation costs Comcast has already incurred, plus 20% (on-net), or 120% of those costs (off-net).
SLA credits. Outages under 4 minutes earn nothing. After that, credits run 5% of the monthly charge for 4 minutes to 4 hours, 10% for 4 to 8 hours, 20% for 8 to 12 hours, 30% for 12 to 16 hours, 40% for 16 to 24 hours and 50% for 24 hours or more. Credits are capped at 50% of the monthly charge, and you must claim them in writing within 30 days.
Wireless Connect has no SLA. The cellular backup is useful, but its uptime is not covered. Your wireline credits still apply.
Coax to fiber migration. Comcast can move a circuit from coax to fiber if the specs stay the same or improve. The cutover counts as scheduled maintenance, not an outage, and it does not reset your term or raise your rate.
Auto-renewal and notice windows live in the sales order and general terms, not this attachment. Read those too: see Read this before you auto-renew a 36-month term.
Learn the lingo
Frequently asked questions
Is Comcast Business the same as Xfinity?
Same company, different products. Xfinity is Comcast's residential brand. Comcast Business sells to businesses, with business support, static IP options and, on Dedicated Internet, a service-level agreement. A home office can use either, but only Comcast Business offers dedicated circuits.
What is the difference between Comcast Dedicated Internet and Comcast Business Internet?
Business Internet is shared broadband: fast downloads, slower uploads, no availability SLA. Dedicated Internet reserves bandwidth for your site, is symmetrical, and carries a 99.99% availability SLA with credits. That is why a 1 Gbps DI circuit can cost five times a 1 Gbps broadband plan.
How much does Comcast Business fiber cost?
On a 36-month term, Comcast Dedicated Internet typically runs $375 to $450 a month at 100 Mbps and $800 to $1,000 at 1 Gbps. Off-net addresses, shorter terms and extra IP blocks push it higher. Comcast does not publish DI pricing; the address decides it.
How long does a Comcast Dedicated Internet install take?
About twelve weeks is typical. Where Comcast fiber is already in the building, it can be much faster. Where it needs to build, permits and construction can stretch it longer. If you have a hard move-in date, tell us up front and we will quote the carriers that can meet it.
Can I get Comcast Dedicated Internet over coax?
Yes. Comcast sells DI over hybrid fiber-coax at symmetrical speeds up to 300 Mbps, with the same 99.99% SLA as fiber DI. It costs less and often installs faster, but it cannot grow past 300 Mbps without a move to fiber.
Does Comcast Business have a data cap?
The 1.2 TB monthly limit that comes up in searches is Xfinity's residential data policy. Dedicated Internet is sold by committed bandwidth, not by usage. For business broadband, ask Comcast to confirm in writing whether any usage policy applies to your account before you sign.
Is Comcast a good backup for a fiber circuit?
Often, yes. Coax usually reaches the building on different infrastructure than another carrier's fiber, which is what makes a backup worth having. We still check the building entrance and route, because a backup that shares conduit with the primary fails with it.
What happens if I cancel a Comcast Dedicated Internet contract early?
On an on-net circuit, you owe 100% of the remaining monthly charges in the first year, 80% in the second, and 65% after that, plus any unpaid installation fees. Off-net circuits owe 100% of what remains. Plan your term around your lease, not the lowest monthly rate.