Dedicated Fiber (DIA)
Guaranteed bandwidth with enterprise-grade SLA commitments
Overview
Dedicated Internet Access (DIA) over fiber provides a private, unshared connection between your business and the internet backbone. Unlike residential or shared business fiber, DIA guarantees symmetrical bandwidth with contractual Service Level Agreements (SLAs) for uptime, latency, jitter, and packet loss. When your business cannot tolerate slowdowns, outages, or variable performance, DIA is the gold standard. It is the connection type behind every major website, cloud service, and enterprise network you rely on daily.
Typical Speeds
100 Mbps - 10 Gbps
download
Avg. Monthly Cost
$300 - $5,000+
per month
Availability
Most commercial areas with fiber infrastructure
coverage
How It Works
A DIA fiber circuit runs from your ISP's Point of Presence (PoP) directly to your business location on a dedicated fiber pair that is not shared with any other customer. At the PoP, your traffic enters the ISP's backbone network and reaches the public internet through peering and transit arrangements. The key difference from shared services is that no other subscriber's traffic ever touches your fiber or contends for your bandwidth. Your contracted speed is guaranteed at all times. The provider monitors the circuit 24/7 and is contractually obligated to meet SLA thresholds. Typical SLAs guarantee 99.99% uptime (less than 53 minutes of downtime per year), latency under 10ms to the provider's backbone, zero packet loss, and jitter under 1ms. If the provider fails to meet these metrics, you receive service credits.
Speed Ranges
Typical Download
100 Mbps - 10 Gbps
Typical Upload
100 Mbps - 10 Gbps
Max Download
100 Gbps
Max Upload
100 Gbps
Pros
- Guaranteed symmetrical bandwidth, always delivering the speed you pay for
- Enterprise-grade SLAs with financial penalties for underperformance
- Dedicated connection with no shared bandwidth or peak-hour congestion
- 24/7 proactive monitoring and priority support from the provider
- Static IP addresses included for hosting servers and VPN endpoints
- Scalable: upgrade bandwidth without changing physical infrastructure
Cons
- Significantly more expensive than shared fiber or cable business internet
- Installation and provisioning can take 30-90 days
- Long-term contracts (typically 12-36 months) are standard
- Overkill and unnecessarily expensive for small businesses with basic needs
- Requires professional installation and potentially a network equipment upgrade
Best For
- Businesses hosting customer-facing applications, websites, or SaaS platforms
- Companies with multiple locations connected via SD-WAN or MPLS
- Healthcare, finance, and legal firms with compliance and uptime requirements
- Call centers and VoIP-dependent businesses requiring zero-jitter connections
- Data-heavy operations like media production, engineering, and scientific research
- Organizations that need static IP addresses and reverse DNS for email servers
Availability
DIA is available in most commercial districts, office parks, and industrial areas where fiber infrastructure already exists. Major providers include Lumen (CenturyLink Business), Comcast Business, AT&T Business, Spectrum Enterprise, and regional providers like Zayo, Cogent, and GTT. Availability depends on your building's proximity to existing fiber routes. In many cases, the provider will extend fiber to your building at no cost if you sign a multi-year contract. In areas without existing fiber, construction costs can be substantial. A site survey is typically the first step in ordering DIA.
Compared to Other Technologies
DIA is the step up from shared business fiber and cable business internet. A shared business fiber connection might deliver 500 Mbps at $100/month, but speeds are not guaranteed and there is no SLA. DIA at 500 Mbps might cost $800-$1,500/month, but you get a guaranteed, dedicated connection with contractual uptime commitments and priority support. Compared to dark fiber, DIA is a managed service: the provider handles the equipment, monitoring, and maintenance. You plug in your router and get internet. Dark fiber gives you more control but requires you to manage the entire stack. For most businesses, DIA provides the right balance of performance, reliability, and managed simplicity.
Frequently Asked Questions
What is the difference between dedicated and shared fiber internet?
Shared fiber (like most residential and basic business plans) uses a technology called GPON where multiple customers share bandwidth on a single fiber strand. During peak hours, your actual speeds may be lower than your plan's advertised maximum. Dedicated fiber gives you an exclusive connection that is never shared. The speed you pay for is the speed you always get, backed by a contractual SLA. You also get symmetrical speeds, static IPs, and priority support.
Who needs dedicated internet access?
Any business where internet downtime or degraded performance directly impacts revenue or operations. This includes companies running cloud-based applications, VoIP phone systems, point-of-sale systems, video conferencing, or customer-facing web services. If your team cannot work without the internet, or if your customers interact with your business online, DIA provides the reliability guarantee that shared connections cannot.
What does an SLA guarantee for dedicated fiber?
A typical DIA SLA guarantees: 99.95-99.99% network uptime (less than 4.4 hours to 53 minutes of annual downtime), latency under 10-15ms to the provider's backbone, packet loss under 0.1%, and jitter under 1ms. If the provider fails to meet these commitments during any billing period, you receive service credits, typically 5-25% of your monthly charge per SLA breach. The SLA also defines response time commitments for trouble tickets, usually 15-60 minutes for critical issues.
Related Reading
Dedicated Fiber vs Shared: What Your Business Actually Needs
Understanding the real difference between dedicated internet access and shared fiber for your business — when DIA is worth the premium and when shared service is perfectly fine.
Choosing Business Internet for Your Small Office
A practical guide to business internet service for small offices — what SLAs mean, dedicated vs. shared connections, and what questions to ask ISPs before signing a contract.
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