NBN Enterprise Ethernet CoS Explained

You might have heard about NBN EE CoS, Low CoS, or High CoS, but what’s the difference? CoS means Class of Service. Basically, it defines different service options. It is commonly said that there are three categories which are Low, Medium, and High class.

Low CoS provides best-effort bandwidth which means there will be no guarantee of any kind. However, depending on other users’ usage who share the network, you might get maximum bandwidth or might not. This is called Exchange Information Rate (EIR). Therefore, it is suitable for email, web-browsing, or other low priority applications.

To describe this more vividly, imagine there is a footpath filled with people walking around. Even if you want to run down the street, you simply cannot, because other people get in your way. However, you can still find a way to go forward. It depends on other people. If all the others are carrying heavy and big luggage, it is certainly not easy to walk through all of that. If there are not many people, then you can walk through or might even run.

On the other hand, High CoS is a dedicated service. You will get 100% of the bandwidth at the Network Termination Device (NTD), and this is called Committed Information Rate (CIR). There are numerous factors that can affect the speed at the endpoint, though, High CoS guarantees the speed at NTD. Hence, it is best for Voice, hosted voice, VoIP, video conference, or other time sensitive applications.

Let us stick to the analogy a bit more. It would be so much easier for you if there is no one on the street. You can occupy the whole footpath and run as fast as you can. The whole footpath is ready for you. This is High CoS.

Then what is Medium CoS? Going back to the analogy, you need to share 3/4 of the footpath, but 1/4 of it is entirely yours. It is okay when you are walking alone, but if you have big luggage with you, you might need to get through a bit. It guarantees 25% of total bandwidth, but the rest of it remains best-effort.

Here is a table highlighting the difference between each NBN EE CoS.

  Low Medium High
Bandwidth Not guaranteed 25% Guaranteed at NTD Guaranteed at NTD
Service type Best-effort 1/4 Dedicated
3/4 Best-effort
Information Rate 100% EIR (Exchange Information Rate) 25% CIR
75% EIR
100% CIR (Committed Information Rate)
Apply to Low priority application Medium priority application Time-sensitive application
Example Web browsing, email etc. Interactive video, financial/trading, etc. Voice, hosted voice, video conference etc.

If you would like to find out more about which service suits you better for your business demand or what benefits it can give you, please contact us on 1300 513 262 or email NetVault Sales at sales@netvault.net.au or click here.

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