If you’ve asked more than one provider for a business internet quote, you’ve probably had this exact conversation: one salesperson pitches you “unlimited high-speed broadband,” another pitches an “internet leased line,” and the price difference between the two looks hard to justify on a spec sheet alone. They’re not competing products solving the same problem — they’re built for different problems, and picking the wrong one is either an overspend or a real operational risk, depending on which way you get it wrong.
What Corporate Broadband Actually Is
Corporate broadband is business-priority fiber internet, typically shared among a small number of business customers on the same local segment. It’s routed and supported differently from a residential connection — faster fault response, a static IP option, priority traffic handling — but the underlying bandwidth is still contended: several customers draw from the same pool of capacity, so your actual throughput can dip during peak local usage, even if it rarely drops to a crawl.
That trade-off is exactly why it costs less than a leased line. For a business where a slightly slower hour now and then is an inconvenience, not a crisis, that’s a completely rational trade.
What an Internet Leased Line (ILL) Actually Is
An Internet Leased Line — also called Dedicated Internet Access — is a private circuit reserved exclusively for one customer, from the provider’s network straight to your premises. Nobody else’s traffic shares that bandwidth. Because of that, upload speed equals download speed (symmetrical), and because the provider fully controls that dedicated path end to end, they can attach a contractual, legally binding uptime commitment to it — something that’s structurally impossible to guarantee on a shared connection.
The Real Differences, Side by Side
| Parameter | Corporate Broadband | Internet Leased Line (ILL) |
|---|---|---|
| Contention | Shared among a small group of business customers | 1:1 dedicated — zero contention |
| Upload vs. download | Usually asymmetrical (upload lower than download) | Symmetrical — equal in both directions |
| Uptime commitment | Best-effort target, no contractual guarantee | Contractual SLA (e.g. 99.9%) with defined service credits |
| IP addressing | Static IP usually available as an add-on | Dedicated static IP subnet included |
| Typical cost | Lower | Higher, priced for the guarantee |
| Best suited to | Offices, showrooms, co-working spaces, professional firms | Manufacturing plants, hosted servers/ERP, financial transactions, multi-site HQs |
Where Broadband Is the Right Call
- A 10-40 person office running standard SaaS tools, email, and video calls
- A showroom or retail location that needs reliable POS and guest Wi-Fi, not zero-downtime infrastructure
- A professional services firm (accounting, legal, consulting) without a hosted server on-site
- A co-working space where per-desk bandwidth matters more than a single dedicated pipe
Where a Leased Line Is the Right Call
- A manufacturing plant running SCADA systems, industrial IoT, or real-time inventory ERP that can’t tolerate a connectivity gap mid-shift
- Any business hosting its own server, ERP (SAP, Oracle, Tally on-prem sync), or PBX that depends on a stable, symmetrical connection
- Financial or legal operations where a dropped transaction or a compliance system going offline has a direct cost
- A corporate HQ that’s the anchor site for a multi-branch SD-WAN rollout
For more on the operational cost of getting this wrong, see our related piece on the hidden cost of internet downtime.
Three Assumptions That Lead to the Wrong Choice
“Our fiber connection is already fast, so it’s basically the same as a leased line”
Raw speed and dedicated bandwidth are different things. A 200 Mbps shared broadband connection and a 200 Mbps leased line can post identical numbers on a speed test taken at 11pm and behave very differently at 11am when every other business on that segment is also online. Contention ratio, not headline speed, is what determines consistency during business hours.
“Broadband is always cheaper in the long run”
It’s cheaper per month, which isn’t the same as cheaper overall. If an outage or a slow period during a critical operation — a production run, a closing-time transaction batch, a client demo — causes real financial loss even occasionally, the SLA and credits attached to a leased line can offset the price difference faster than expected. The right comparison is monthly cost plus realistic downtime risk for your specific operation, not monthly cost alone.
“A leased line takes too long to set up, so we’ll just start with broadband”
For buildings already on an existing optical route, activation can be as fast as 2-4 business days — not meaningfully different from a broadband install. It’s genuinely off-net sites needing new fiber trenching that take longer (typically 5-10 business days after a feasibility survey), and that’s true of any serious business fiber install, broadband included.
A Simple Way to Decide
Ask one question honestly: if this connection went down for an hour during business hours, what would it actually cost you — in lost production, missed transactions, or a client-facing failure? If the honest answer is “an inconvenience,” corporate broadband is the right, cost-effective choice. If the honest answer involves a number that would concern your finance team, a leased line’s contractual SLA is what you’re actually paying for.
Frequently Asked Questions
Can we start with broadband and upgrade to a leased line later?
Yes. Many businesses start on Corporate Broadband and move to a dedicated Internet Leased Line as a specific operation (a new ERP deployment, a production line going live) makes uptime genuinely critical. The physical fiber path is often already usable; the upgrade is a service change, not a re-cabling project.
Do we need a leased line for every site, or just the critical one?
Most multi-site businesses run a leased line at the HQ or primary production site and corporate broadband at lower-criticality branch offices, tied together with SD-WAN for unified management and failover.
Is a leased line only relevant for large enterprises?
No — it’s relevant wherever downtime has a real cost, regardless of company size. A single-location manufacturing unit with a hosted ERP server has the same underlying need as a large enterprise; the connection just needs to be sized to that one site.
If you’re weighing this decision for a specific building or operation, our team can walk through the actual trade-off for your setup rather than a generic recommendation — get in touch, or read the full specification on our Internet Leased Line page.
