Dedicated Fiber vs Shared: What Your Business Actually Needs

When shopping for business internet, you'll inevitably face a choice between dedicated and shared fiber connections. The pricing gap can be enormous — a 100 Mbps dedicated connection might cost $500 to $1,000 per month, while a 100 Mbps shared fiber plan runs $100 to $200. That's a five-to-one price difference for what sounds like the same speed.

So what are you actually paying for with dedicated internet access (DIA), and does your business need it?

How Dedicated Internet Access Works

A dedicated internet access circuit provides exactly the bandwidth you pay for, guaranteed, 24/7. If you buy a 100 Mbps DIA circuit, you get 100 Mbps upload and 100 Mbps download at all times, regardless of what anyone else on the network is doing.

The "dedicated" part means the bandwidth is reserved exclusively for your business. It's not shared with other subscribers, not oversubscribed, and not subject to congestion during peak hours. The provider allocates that capacity to you and no one else.

DIA circuits also come with enterprise-grade SLAs that typically include:

• 99.99% uptime guarantee (roughly 52 minutes of downtime per year)
• 4-hour or less repair response for outages
• Guaranteed speed — not "up to" speed
• Symmetrical bandwidth — same speed up and down
• Service credits if the provider misses SLA targets
• Dedicated account management and priority support

How Shared Business Fiber Works

Shared business fiber is more like a residential connection with business-grade support. The provider allocates a pool of bandwidth across a group of subscribers, with the expectation that not everyone will use their maximum speed simultaneously.

This is called oversubscription, and it's how cable and shared fiber ISPs keep prices affordable. A provider might sell 100 Mbps plans to 50 businesses on a single 1 Gbps port, knowing that typical usage at any given moment will be far below the aggregate 5 Gbps they've technically sold.

Most of the time, this works fine. You'll get speeds close to what you're paying for because most businesses don't use their full bandwidth continuously. But during peak periods — or if a neighbor on your shared port is running a large backup or transfer — your speeds may dip.

Shared business fiber typically comes with less aggressive SLAs:

• 99.9% uptime guarantee (roughly 8.7 hours of downtime per year)
• 8-hour or next business day repair
• "Up to" speeds rather than guaranteed minimums
• Asymmetric or symmetric options depending on provider
• Standard business support

When You Need Dedicated

Dedicated internet access is worth the premium when:

Internet is revenue-critical. If downtime directly costs you money — you run an e-commerce business, SaaS platform, financial trading operation, or call center — the guaranteed uptime and rapid repair of DIA pays for itself quickly. An hour of downtime that costs $5,000 in lost revenue makes a $500/month DIA circuit look cheap.

You need consistent upload speeds. Businesses that push large amounts of data upstream — backing up to the cloud, hosting services, streaming video, running VPN for a distributed workforce — need the symmetrical, guaranteed bandwidth that DIA provides. Shared connections often have much lower upload speeds and no upload guarantees.

You have latency-sensitive applications. VoIP phone systems, video conferencing, and real-time applications suffer on congested, shared connections. The jitter and packet loss that come with network congestion can make phone calls drop and video freeze. DIA's guaranteed bandwidth eliminates this.

Compliance requires it. Some industries — healthcare, finance, government contracting — have compliance requirements around data security and network performance that effectively mandate dedicated connections.

When Shared Is Fine

For many small and mid-sized businesses, shared fiber is the smart choice:

Standard office use. If your employees primarily do email, web browsing, and cloud application work, a shared 100 to 500 Mbps connection handles this easily. The occasional dip in speed during peak hours won't be noticeable for these activities.

Cost sensitivity. The price difference between shared and dedicated is significant. A 100 Mbps shared connection at $150/month versus 100 Mbps DIA at $700/month means $6,600 per year in savings — meaningful for a small business budget.

Redundancy through diverse connections. Some businesses achieve reliability by using two less expensive shared connections from different providers rather than one expensive DIA circuit. If one goes down, the other keeps the business running. The combined cost is often similar to or less than a single DIA circuit.

Flexible growth. Shared fiber plans often allow faster speed upgrades without contract renegotiation. Growing from 100 to 500 Mbps on a shared plan might just require a phone call, while upgrading a DIA circuit requires provisioning a new circuit.

Pricing Reality Check

Here's what you can typically expect to pay as of mid-2019:

| Service | Speed | Typical Monthly Cost | |---------|-------|---------------------| | Shared Fiber | 100 Mbps | $100 - $200 | | Shared Fiber | 500 Mbps | $200 - $350 | | Shared Fiber | 1 Gbps | $250 - $500 | | DIA Fiber | 50 Mbps | $400 - $600 | | DIA Fiber | 100 Mbps | $600 - $1,000 | | DIA Fiber | 500 Mbps | $1,500 - $3,000 | | DIA Fiber | 1 Gbps | $2,000 - $5,000 |

These prices vary significantly by market, building, and provider. Urban offices with multiple fiber providers on-net can negotiate better rates. Buildings that require new fiber construction may face installation charges of $10,000 or more.

Getting the Right Answer for Your Building

For businesses evaluating commercial fiber options, working with an independent low voltage and network infrastructure consultant — such as ICTAlly in the Nashville area — can help cut through ISP sales pitches and identify the right solution for the building's infrastructure. An independent consultant doesn't earn commissions from any particular provider, so their advice is focused entirely on your business needs and building constraints.

Key questions a good consultant will help you answer:

• Which providers have fiber lit to your building?
• What's the actual demarcation point and infrastructure inside the building?
• Is the building wiring adequate for the speeds you need?
• Can you negotiate better terms based on competitive options?
• Should you consider a primary DIA circuit with a shared backup?

Our Recommendation

For most small businesses (under 25 employees) doing standard office work, shared business fiber at 100 to 500 Mbps is the right choice. Invest the savings from not buying DIA into a secondary backup connection for redundancy.

For businesses where internet drives revenue, supports VoIP for a significant workforce, or handles latency-sensitive workloads, dedicated internet access is worth the premium. The peace of mind of guaranteed performance and rapid response SLAs justifies the cost.

For businesses in between, consider a hybrid approach: a moderate DIA circuit (50 to 100 Mbps) for critical applications combined with a shared connection (100+ Mbps) for general use and failover. This gives you the reliability of dedicated access where it matters while keeping costs manageable.