Bonded FTTC for Business: Dual Line Fibre Broadband Guide

FTTC — fibre to the cabinet — remains one of the most widely available business broadband technologies in the UK, reaching the large majority of commercial premises. A single line typically delivers up to 80Mbps download and 10–20Mbps upload, in line with the superfast broadband range Ofcom reports for the technology (Ofcom). For teams that need more capacity without the cost and lead time of a leased line, bonded FTTC is a useful step up. This guide explains how it works, the speeds and costs to expect, and when a business leased line is the better call.

How Does Bonded FTTC Actually Work?

Bonded FTTC provisions two separate FTTC circuits at your premises — each using its own physical line from the street cabinet to your building. A bonding router connects to both circuits at once and distributes inbound and outbound traffic across both active lines, so you draw on their combined capacity.

The key distinction is between basic load balancing and true bonding. Load balancing sends whole sessions — a browsing session, a file download — down one line or the other, alternating between them. True bonding aggregates both circuits into a single logical pipe and can split portions of an individual stream across both lines, delivering closer to the combined theoretical throughput.

For everyday business workloads — Teams calls, cloud apps, remote desktop — the practical gap between well-configured load balancing and full aggregation is often modest. The resilience benefit is the universal win: when one line fails, the other carries all traffic automatically, with no manual intervention.

What Speeds Can You Expect From Bonded FTTC?

Achievable speed depends on your distance from the street cabinet. FTTC runs fibre to the cabinet but the final leg is copper, and performance drops over longer copper runs — the same distance effect Ofcom documents for fixed broadband (Ofcom). The figures below are typical UK 2026 bonded-pair aggregates, not guarantees.

Upload speeds are typically 8–20Mbps per line depending on distance and provider. A bonded pair gives 16–40Mbps combined upload — meaningfully better than a single FTTC line for video calls and cloud backups, though still asymmetric. If you upload large files all day, weigh that asymmetry against a symmetric dedicated internet access circuit.

What Does Bonded FTTC Cost?

Bonded FTTC pricing varies by provider and location, but for a 24 or 36-month managed contract it typically falls into the ranges below. Treat these as market guidance, not a quote — your address and line availability move the number.

• Bonded FTTC pair (managed service, includes bonding hardware): £90–£160/month
• Bonded FTTC pair (circuits only, your own bonding router): £55–£100/month for the two circuits

If you supply your own bonding router, budget roughly £350–£700 for a suitable device such as a Draytek Vigor 2865 or Peplink Balance 20X. Some providers include compatible hardware in a managed bonding service, which typically adds £20–£40/month but removes the hardware management burden from your team.

Bonded FTTC vs a Single FTTC Line — When Should You Upgrade?

The case for moving from a single FTTC line to a bonded pair is strongest when one line is no longer keeping up or downtime has become expensive. Bonding buys both headroom and resilience in one move, which is why it is a common interim step before full fibre or a leased line.

Upgrade when:

• Your team hits slowdowns at peak hours because the single line is saturated
• You have had FTTC faults and cannot afford any period of total connectivity loss
• You run hosted VoIP and need steadier bandwidth for concurrent calls
• You are adding staff and bandwidth per user is becoming inadequate

Bonded FTTC vs a Leased Line — Which Is Right?

FTTC, even bonded, is a shared-access technology. At peak times the path from the cabinet back to the exchange is shared with other users, which can pull real-world performance below headline speeds. A business leased line provides dedicated, uncontended bandwidth with guaranteed performance and a formal SLA.

Bonded FTTC suits businesses with roughly 10–30 staff where reliable internet matters but is not strictly mission-critical. If you have more than 30 staff, or your business genuinely cannot operate without connectivity, a leased line is the more appropriate and defensible investment. The two are also complementary: bonded FTTC makes a credible backup circuit behind a primary leased line.

What If FTTP Full Fibre Is Available?

If full-fibre FTTP is live at your premises, a single FTTP circuit at 300–1,000Mbps will usually outperform bonded FTTC at a similar or lower cost. FTTP is being rolled out rapidly across the UK under the government's Project Gigabit programme (gov.uk), so coverage changes month to month.

Before ordering bonded FTTC, check whether FTTP has reached your area. AMVIA checks availability against your specific postcode across Openreach, CityFibre and alternative network providers, so you do not pay for a bonded copper solution when full fibre is sitting outside your door.

How Long Does Bonded FTTC Take to Install?

Provisioning two FTTC lines typically takes 10–20 working days (typical UK 2026 lead time). If your building already has two active phone lines, it is faster. If a second line must be provisioned, Openreach may need to install an additional connection, which extends the timeline. Plan the order before your current contract or capacity becomes a problem rather than after.

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