You pay for a broadband package that promises impressive speeds, and when you test it first thing in the morning, it delivers. By mid-afternoon, with the whole team on video calls, uploading files and running cloud software at once, everything grinds to a crawl. Nothing has changed on paper, so what is going on? The answer is usually buried in a part of your contract most business owners never read closely: the contention ratio.
What is contention ratio?
Contention ratio describes how many customers share the same bandwidth at your local exchange or cabinet. A ratio of 50:1 means up to 50 other connections are sharing the same capacity as yours. During quiet periods, you may never notice it because few people are online at once. During busy periods, typically mid-morning and mid-afternoon in office environments, everyone is pulling from the same shared pool, and speeds drop for everyone using that connection.
This is normal on most standard business broadband products. It is not a fault or a sign your provider has done anything wrong. It is simply how the product is built, and it is one of the main reasons advertised speeds and real-world speeds can differ so much.
Why advertised speed does not tell the whole story
A headline speed figure, such as "up to 80Mbps", describes the theoretical maximum under ideal conditions. It says nothing about how many other businesses are drawing on that same infrastructure at the same time as you. Two businesses could buy an identical package, on paper, and have very different real-world experiences depending on the contention ratio attached to each one.
This matters more now than it used to. A decade ago, a slow afternoon connection was an inconvenience for browsing and email. Today, with cloud accounting software, VoIP phone systems, video calls and remote access tools all competing for the same bandwidth, a congested connection can genuinely stop a business functioning properly during its busiest hours.
Shared contention versus dedicated bandwidth
Broadband products generally fall into a few categories:
- Standard business broadband: usually has a contention ratio somewhere between 20:1 and 50:1. Affordable, but performance can dip at peak times.
- Leased lines: offer a dedicated, uncontended connection that is yours alone. More expensive, but speeds stay consistent whatever time of day it is.
- Some fibre and Ethernet products: sit between the two, with lower contention ratios than basic broadband but not fully dedicated capacity.
The right choice depends on how much your business relies on consistent connectivity. A small retail shop using broadband for card payments and basic admin has very different needs to a design agency uploading large files all day, or a call centre running dozens of simultaneous VoIP calls.
Questions to ask before you sign
Before committing to a broadband contract, it is worth asking the provider directly:
- What is the contention ratio on this specific package, not just the general product line?
- Is this a shared connection, or is a dedicated or low-contention option available at this location?
- What speeds have other business customers in this area actually reported during peak hours, rather than the theoretical maximum?
- Is there a service level agreement covering minimum guaranteed speeds, and what happens if those are not met?
- What are the options and costs to upgrade later if the business grows or usage increases?
A provider who can answer these clearly and specifically is usually one worth dealing with. Vague answers or a reluctance to discuss contention at all is a sign the headline speed is doing most of the selling.
Getting connectivity right for your business
Contention ratio is not something most business owners think about until it starts costing them time and productivity every afternoon. Understanding it puts you in a much stronger position when comparing quotes, because the cheapest headline speed is not always the best value once you factor in how consistently it actually performs.
At Valetech Solutions, we help Greater Manchester businesses assess their connectivity needs properly, comparing contention ratios, line types and service level agreements so you are not caught out by a contract that looks good on paper but falls apart during your busiest hours. If your connection is holding your team back, get in touch with Valetech Solutions.