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Slow FTTC: Difference between revisions
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Things to do if you have slow FTTC:▼
You can test speed with our speed tester: [http://speedtest2.aa.net.uk speedtest2.aa.net.uk]
▲Things to do if you have '''slow FTTC''':
#Disable WiFi and check speed with a wired connection
#Go through the [[FTTC Checks]]
#Check the CQM Graphs, to see if it is slow due to lots of traffic
# Is your line actually slow? Other issues caused by services such as DNS or the device itself can cause things to ''appear'' slow without actually being slow! Double check with other people in the property that they are experiencing the same.
# If you are having trouble narrowing down culprits, or you are seeing unusual usage [https://control.aa.net.uk/ on your Control Page graphs], then we would suggest contacting Support, who can perform a traffic dump for you. This traffic dump can only be done in realtime and not historically. '''Our traffic dumps can only be performed with prior permission, and will only capture the packet headers, not the content.'''
# Ask us about testing with ''''iperf'''' - as this is generally better than http speed test websites. See: https://support.aa.net.uk/Windows_iperf3
#Contact Support for further assistance.
[[File:Snail's-pace.png|none|frame|100px|Snail's pace broadband?]]▼
If you have problems with Streaming high definition video, [[Streaming UHD 4K Video|We have a page with some help]]
== CQM Graphs ==
One of the issues with a fast internet connection is that you realise how slow some of the internet is. The Ethernet services we provide have no delays or congestion between you and high speed transit providers in our London data centre racks, so they are fast as you can get for a general internet connection. There are a few points to bear in mind when you have a fast internet link.
Speed tests sites can be busy anyway but most are not designed to measure speeds of lines much above that of broadband so if you have even a
TCP window. The way TCP works means that it has buffering for in-transit data. Even broadband links can have issues with these buffers not being big enough. Ethernet links are normally local meaning delays of micro seconds in traffic going from one machine to another. However, our Ethernet services work over the whole country and this takes milliseconds. A millisecond is not long, but it hundreds to thousands of times longer than you would find on a LAN. As such a data transfer on a high speed link can be limited by the buffering (TCP window size) on the computers at both ends. It is worth trying several transfers at the same time if you are trying to get the most total data transfer speed out of your link.
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