Does Your Business Need a Leased Line?

Broadband vs Leased Line: The Core Difference

Standard business broadband — whether FTTC or FTTP — is a contended product. Your broadband connection shares capacity with neighbouring businesses and households on the same exchange or cabinet. In most circumstances this works acceptably, because not everyone is using maximum bandwidth simultaneously. But during peak periods, or when your specific usage is consistently high, the shared nature of broadband becomes a problem.

A leased line is an uncontended, dedicated circuit. Nobody else shares your bandwidth. Your 100Mbps is 100Mbps at 9am on Monday morning, at lunchtime on Wednesday, and at 5pm on Friday. It also provides symmetrical speeds — upload equals download — and comes with a formal SLA that defines exactly what the provider will do and when if a fault occurs.

Seven Signs Your Business Needs a Leased Line

1. Slow Performance at Peak Times

If your broadband connection performs well at quiet times but slows noticeably during business hours, the issue is contention — too many users sharing the same capacity. Broadband speed tests run at 8pm will look very different from those run at 10am on a weekday. If the morning test regularly shows speeds well below the advertised figure, your connection is contended beyond its practical capacity.

2. VoIP Call Quality Issues

VoIP call quality is sensitive to latency, jitter, and packet loss — all of which are affected by network congestion. If your business regularly experiences choppy audio, delayed responses, or dropped calls during busy periods, the internet connection is frequently the cause. A leased line's consistent low-latency performance resolves this problem structurally rather than relying on QoS configuration on a contended connection.

3. Remote Working Performance Problems

Businesses with significant numbers of staff working remotely and accessing a central VPN, hosted desktop, or on-premises applications need consistent upload performance at the office end of the connection. Broadband upload speeds — even on FTTP — are often asymmetric. A 300Mbps FTTP product may provide only 50Mbps upload. For a heavily remote-working organisation, low upload speeds at the office bottleneck the experience for everyone accessing remotely.

4. Cloud Backup and Data Replication Requirements

Organisations running nightly cloud backups of multi-gigabyte or multi-terabyte datasets need sufficient upload bandwidth to complete the backup within the available window. A broadband connection with 20Mbps upload takes over 6 hours to upload 50GB. A 100Mbps leased line completes the same upload in approximately 66 minutes. For growing businesses with expanding data volumes, upload speed quickly becomes the binding constraint.

5. Hosted Services or Public-Facing Servers

Any business running public-facing web servers, customer-accessible applications, or hosted services needs a static IP address, consistent upload performance, and a formal SLA. Broadband static IPs are available but carry no upload performance guarantee. A leased line provides all three elements as standard and is the appropriate infrastructure for any externally accessible hosted service.

6. More Than 30 Users on the Same Connection

Thirty simultaneous users running video conferencing, Microsoft 365, and cloud applications generate peak combined demand in the range of 60–120Mbps. FTTP broadband at 300Mbps provides sufficient download headroom, but if upload demand is similarly high, broadband's asymmetric speed profile begins to constrain performance. Above 30 users, a leased line becomes the appropriate solution for most cloud-intensive businesses.

7. Downtime Has Serious Financial Consequences

Broadband has best-efforts fault response. Business SLAs exist but rarely commit to resolution within a few hours. If your business processes — transactions, operations, customer service — effectively stop during an internet outage, the case for a leased line SLA is straightforward: the cost of an extended outage almost certainly exceeds the monthly premium of a dedicated circuit with a 4-6 hour fix guarantee.

When Broadband Is Still the Right Answer

For businesses with fewer than 20 users, no hosted services, no heavy upload requirements, and reasonable tolerance for the occasional slow period, FTTP broadband provides excellent value and sufficient performance. The gap between broadband and leased line has narrowed as full-fibre has expanded, and many businesses that previously needed a leased line for performance reasons can now meet their needs with gigabit FTTP at a fraction of the cost.

The right answer depends on your specific usage pattern, team size, and tolerance for performance variation. AMVIA assesses client connectivity requirements before recommending a product, rather than defaulting to the higher-margin option.