Lower broadband speed.

[ClairKell88]

I upgraded my package the gigafast broadband over a month ago now. I should be getting between 780 -930mb/s according to information I see under my account, i also have sky broadband booster on my account too. Since I have upgraded to this package I've only been getting 669mp/s even during the evenings when nothing is being used apart from my tv. I have read that I should be able to get money off my bill if I have lower speeds for 3 days in a row. I don't think its fair that I am I am paying for something that I am clearly not receiving. I have also gone through the tips to better my broadband speed but to no avail. What can I do to resolve this? Has anyone else gone through this and has been resolved?

[Chrisee]

@ClairKell88 Measuring speeds on fibre lines is very difficult as therecis no direct method as the hub doesnt report the speed. 

.So how are you measuring speed? If its on a device connected by  wifi you are likely simply measuring the speed of thecwifi in your home. 670Mb/s is pretty typical if you are using a device using WiFi5. You would need to measuring speeds over a direct Gigabit Ethernet link to have anything reliable. If you arre using the speedtest results in Sky's service checker this under records which is an issue Sky are looking into. However if speeds drop below the minimum on their messure for your service for 3 days Sky will credit months payment if you are in contract. See https://www.sky.com/help/articles/sky-broadband-speed-guarantee.  

You need to understand how Openreach's fibre technology works.  The optical signal is generated in the exchange andis connected to acfibre which can carry up to 2.48Gb/s to your local distribution points where a series passive optical splitters give up to 32 feeds  for customers. The ONT units in your home pick up the date addressed to you and feed it to the hub and ignore the data not addressed to you. This is in very simple terms is how GPON works.

It doesnt take a genius to realise that 32 feeds sharing a link with under 2.5Mb/s of data could intefere. In practice though it rarely happens as unless you are running a speed test most customers use far less bandwidth than they think. Most apps cannot use more than 100Mb/s so  for example streaming football in UHD/HDR uses around 25Mb/s playing online games uses under 10Mb/s. Obviously downloading can use more bandwidth but rarely will servers allow unlimited bandwidth to a client.Therefore contention is rare in practice.

This is why ISPs can sell the highest bandwidth products for a few pounds more than the lower bandwidth ones as on average the extra bandwidth is rarely used. Its the same logic why unlimited data mobile deals dont cost the earth. If you are a heavy user you gain unless if course you share a fibre dustribution pointvwith a number of others.if you wantedca guaranteed uncontended gigabit product you would be talking several hundred if not thousands a month.