How to Choose a Leased Line Provider: 7 Questions to Ask

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CONNECTIVITY · GUIDES

6 July 2026

6 min read

How to choose a leased line provider: 7 questions to ask

Choosing the wrong leased line provider is an expensive mistake. Here are the seven questions every business should ask before signing a contract.

A leased line is not a commodity purchase. Unlike broadband, where switching providers is relatively painless a leased line involves a physical infrastructure installation, a multi-year contract, and an ongoing managed service relationship. Getting it wrong is expensive, disruptive, and difficult to undo quickly.

Question 01

What uptime SLA do you offer and what happens if you miss it?

An SLA is only as valuable as the remedy attached to it. Any provider can write 99.99% on a datasheet. The question is what they commit to doing when they fall short of it.

Ask specifically: is the SLA contractual? What is the financial remedy for a breach? How is downtime calculated and who measures it?

For reference, a 99.98% uptime SLA permits roughly 105 minutes of downtime per year. A 99.9% SLA permits around 8.7 hours. That difference matters, particularly for businesses running payment systems, cloud software, or hosted telephony.

Question 02

Is the connection truly uncontended?

A leased line should be an uncontended, dedicated connection. That means the bandwidth is yours alone and is not shared with other users. This is the fundamental difference between a leased line and broadband, and it is the reason businesses pay a premium for it.

Not all providers are transparent about contention ratios. Some products marketed as leased lines or ethernet connections carry contention ratios that mean your speeds can degrade during peak periods. That is exactly the opposite of what you are paying for.

Ask the provider directly: what is the contention ratio on this product? The answer should be 1:1. If it is not, it is not a true leased line.

Question 03

Who monitors the line and when?

Proactive monitoring is the difference between knowing about a fault before it affects your business and finding out when a member of staff tells you the internet is down.

Ask whether the provider operates a network operations centre, what hours it is staffed, and what happens when a fault is detected. Is monitoring automated with no human oversight overnight? Is there a team watching your circuit around the clock, or only during business hours?

The best providers operate a 24/7 NOC. That is a dedicated team that watches every circuit continuously and begins response the moment a fault is detected. If a provider cannot tell you clearly who monitors your line and when, that is a gap worth taking seriously.

Question 04

What is your fault response time and is it contractual?

Response time and resolution time are different things. A provider might respond to a fault within four hours but take three days to resolve it. Ask about both.

More importantly, ask whether the response time commitment is contractual. A target is not a commitment. If the provider cannot point you to a documented, contractual response time SLA with a clear escalation process, treat their verbal assurances with caution.

Also ask: what does response mean in practice? Does it mean an automated acknowledgement email, or does it mean an engineer has picked up the fault and begun active diagnosis? The answer will tell you a great deal about the quality of support you can expect.

Question 05

Will I have a named account manager?

When something goes wrong, and at some point something will, you want to be able to call a person who knows your account, knows your setup, and can act immediately. Not navigate an automated phone system, open a ticket, and wait for a first-line agent to read your notes.

Ask the provider whether every client has a named account manager, and what that means in practice. Is it a shared resource covering hundreds of accounts, or a genuine point of contact who knows your business?

This is one of the clearest differentiators between providers who treat connectivity as a product and those who treat it as a managed service. The answer will tell you which one you are dealing with.

Question 06

Which carriers do you work with?

A leased line provider is not usually the carrier who owns the physical infrastructure. They are working with one or more wholesale carriers to deliver your connection. The carriers they work with affect the geographic coverage they can offer, the resilience of the underlying network, and the options available if something goes wrong.

Ask which carriers the provider works with and whether they have access to multiple carrier options for your site. A provider with access to multiple carriers can often offer better resilience, more competitive pricing, and alternative routing if a primary carrier has a service issue.

Providers who work with a single carrier are more limited. In the event of a carrier-level issue, your options are more constrained.

Question 07

What does the installation process look like?

Leased line installations involve physical infrastructure work and coordination with the carrier. Lead times vary, typically between four and twelve weeks depending on location, carrier availability, and whether any civils work is required.

Ask the provider what their typical lead time is for your area, who manages the installation process, and what happens if the installation date slips. Ask whether they survey the site before committing to a price, and whether their quote is fixed or subject to change after survey.

A provider who cannot give you clear answers about the installation process, or who is vague about lead times and what is included, may be setting expectations they cannot meet.

WHAT GOOD LOOKS LIKE

A good provider answers all seven. Clearly, confidently, and in writing.

A good leased line provider will answer all seven of these questions clearly, confidently, and in writing. They will have a contractual SLA with a meaningful remedy, a 24/7 NOC, a named account manager for every client, and a transparent installation process with a fixed quote.

They will also be honest about what they cannot do. The areas they do not cover, the lead times that apply to your site, and the limits of their network.

At ATN Communications, we answer all seven. If you are evaluating providers and want straightforward answers, talk to us.

Talk to ATN about leased lines