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What is contention ratio?

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Many things can affect the speed of your broadband connection but one that has a big impact is contention ratio. We know you must be thinking, what is it and more importantly how does it affect you? Let us explain.

What is it?

Contention ratio is how many other people are sharing the same internet connection, and therefore bandwidth, as you at any one time. The higher the contention the more likely you are to slow down at peak time.  

If you think about roads, we know it sounds random, but just bear with us for a second. If everyone is trying to use the same road at the same time then you end up with a traffic jam. A five minute journey can easily take 40 minutes or more, which can be really frustrating.

The same applies to bandwidth, if everyone is using it at the same time the connection can become congested and you may see your speeds drop, particularly at home in the evening. 

If your contention ratio is 50:1 that means upto 50 people are all using the same connection as you at any one time. If the bandwidth of the shared line is around 100Mbps, you could receive around 35Mbps on average. However, if all 50 people are using it at the same time, then the bandwidth you receive could be as low as 2Mbps.

Which services does it affect?

Contention ratio doesn’t impact every connection although it does affect quite a few. ADSL, FTTC, Gfast, FTTP and GPON are all contended services which means if you have one of these connections other people will share the same bandwidth as you. 

The good news is, corporate connections tend to offer better contention ratios than domestic broadband packages, so the impact isn’t that profound in a business or educational setting. 

Even better, when it comes to leased line and dark fibre connections, contention isn’t an issue because it is effectively a private service, you will receive 100% of the bandwidth at all times.

Fiber Optic cables and ethernet cables in an exchange contention ratio

How do I find out my contention ratio?

Internet service providers don’t tend to publish contention ratio data, so it can be really difficult to know what your contention ratio is. 

However, what they do provide is your minimum download and upload speeds which do take into account an estimate of your contention ratio.

How can contention ratio be managed?

The way in which contention and congestion are managed has changed. It used to be that contention was at the local exchange, so it would be the amount of users all competing for bandwidth from the local internet exchange. Now, the contention happens at a national level so the congestion is spread out more evenly and it’s only really a problem at peak times. 

Individual ISPs also have web traffic management systems to deal with contention. These systems limit congestion on their network, ensuring the stability of your line during busy periods and maintaining high speed performance.

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Is DarkLight connectivity best suited to you?

Dark fibre is perfect if you are looking for a potentially limitless, ultrafast connection with complete flexibility and control.

If you fully rely on the internet, a dark fibre connection could be the best option for you.

Is Leased Line connectivity best suited to you?

Leased Lines are best suited to you if you have high bandwidth requirements and need a reliable, uncontended service.

It is ideal for you if you regularly carry out large uploads and downloads, use cloud based services and a VoIP telephone system as well as video conferencing, for everyday communication.

Is GPON connectivity best suited to you?

GPON is a great choice for you if you need gigabit speeds but don’t need them to be symmetrical. It is becoming more widely available across the UK but may not be immediately available to you yet.

Is Rural Fibre connectivity best suited to you?

If you want to make the move to full fibre, but are based in a rural area, this option is for you.

Is FTTP connectivity best suited to you?

If you have a number of users who use cloud-based applications to upload and download data on a daily basis, but don’t transfer large amounts of data, FTTP might be your best option.

Is Gfast connectivity best suited to you?

If your line cannot support a minimum of 100Mbps, this connection is not for you. Gfast must meet the speed as a minimum. 

If your line meets this need, and you’re looking for an ultrafast, consistent and reliable connection without the hassle and upheaval of construction work – this could be a good fit.

It’s worth noting that Gfast is a stop gap to FTTP, and is not a technology that is likely to be around for a long time.

Is FTTC connectivity best suited to you?

If you need more bandwidth but don’t really need a guaranteed speed, FTTC could be for you. It is widely available throughout the UK, making it suitable as a main connection. As this connection provides higher speeds than ADSL, it is also a good option for a back up to a leased line.

As with ADSL, once the PSTN is turned off in 2025/26, FTTC will become virtually obsolete and at the very least you will require FTTP to remain connected.



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Is DSL connectivity best suited to you?

DSL connections offer very limited bandwidth so it might be right for you if you typically use the internet for less data-intensive tasks. If you’re sending emails, browsing the web, downloading very small files and working with small amounts of data – you should be fine with DSL.

It is worth noting connections based on copper wire, like DSL, will be switched off in the UK by Openreach, with a phased approach due to begin at the end of 2025. If you don’t have a fibre connection at the moment, you’ll need to upgrade this as well as move to a VoIP telephone system.

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