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Callinder's avatar
Callinder
Up to speed
24 days ago
Solved

Broadband speed limited?

Oddly this all arose from the ethernet port on my main PC suddenly starting to fail. I considered this to be something I could easily fix by using a gigabit USB ethernet adapter and initially it worked and I got a gigabit connection. However it all came to an end when my broadband connection was limited to 100 mbps. I assumed it must be the adapter but having changed this 4 times they all suffer from the same problem, 1 gigabit then a sudden drop to 100 mbps. And it not just my PC my mobile phone initially had a 400 mbps connection then suddenly it's restricted to 100 mbps. Again the really infuriating thing is that when I used wifi on my main PC it has no problem maintaining a speed that I thin is reasonable considering the age of my PC and that's about 430-450 mbps second using the RealSpeed - SamKnows site. All my streaming devices are the same, great speeds at start then restricted to ~100 mbps. By the way I have a 1 gigabit broadband contract and a Hub 5 with a single Pod. All ethernet cables are Cat6 or Cat7 and all iperf3 and the CLI version of speedtest readings on my Raspberry 4 and other PCs are all about 950 mbps, i.e. what I expected. Any ideas what's going on?

  • The 94Mbps download is a common indication that something is limiting an ethernet connection to 100Mbps instead of 1000Mbps. This could be a faulty ethernet cable or the devices at either end. 

13 Replies

  • This is with the gigabit adapter aattached and wifi disabled.

    How do you insert the DownStream and UpStream? If a just copy the output from the Hub5 web interface I get a HTML error and the pubish is rejected. I've got PDF files but there seems to be no way to attach them to my reply.

    • carl_pearce's avatar
      carl_pearce
      Superstar

      Search for 'Powershell' on your PC, then select 'Windows PowerShell ISE'.

      Copy/paste the below code into the main window at the top, press the green 'Play' button, then copy/paste the results into a reply on here:

      $adapters = @((Get-NetAdapter).Name)

      For ($i = 0; $i -le $adapters.length-1; $i++) {
      Write-Host (Get-NetAdapter -Name $adapters[$i]).LinkSpeed;
      }

      An example on my PC:

       

       

  • legacy1's avatar
    legacy1
    Alessandro Volta

    Disable EEE (Energy Efficient Ethernet) or green Ethernet in your NIC settings  

    is your PC connected directly to the hub no wall socket?

    • Callinder's avatar
      Callinder
      Up to speed

      I just check the EEE status for my adapter and it's active, ie.e enable. I disabled it using the terminal and confirmed it's now disabled. However after restarting the network it's still showing a 100 mbps connection even though when EEE is active it reports being able to support 1 gigabit. I'll try rebooting and see what happens.

      My PC is connected to the Hub 5 via a gigabit switch and all other devices are connected at 1 gigabit

  • jpeg1's avatar
    jpeg1
    Alessandro Volta

    The 94Mbps download is a common indication that something is limiting an ethernet connection to 100Mbps instead of 1000Mbps. This could be a faulty ethernet cable or the devices at either end. 

  • Just did a speed check to show problem solved. Again thanks for the help/advice.