Airport Extreme router (wired) restricting my speed?

I have the ADSL24 40/10 FTTC product, and I get speeds of about 20/8. I always knew that this seemed low considering that the cabinet is at most 150m away. Finally I got around to trying a few speed tests with a wired connection directly to the OpenReach modem, and this resulted in 38 Mbps down, 8Mbps up - as I would expect being practically on top of the cabinet.
My normal setup is using an Apple Airport Extreme (this old model http://support.apple.com/kb/SP58) as a router with its WAN port wired to the OpenReach modem, and its LAN port wired to a switch. I thought that any wired connection would be good up to 100Mbps - so could the Airport Extreme be somehow limiting my speed?
Any help appreciated. thanks

Which ISP are you with? I think this is an old version of the router so it's possible it's not fully supportive for the highest speeds possible.

Who is your ISP? Did they provide a router?

Edited by ukhardy07 (Fri 31-May-13 10:26:11)

Hi,

The ISP is ADSL24, and they didn't provide a router - just an OpenReach installation which included a modem.

Very possibly the router is the issue, it is not a problem with the ethernet ports as such, but the CPU in the router not being up to the task of routing traffic at 100 Mbps speeds.

There are even older devices that struggle with 10 Mbps type throughputs even though they have 100 Mbps LAN or WAN ethernet ports

Something like this should handle the speeds fine on fibre.
http://www.ebay.co.uk/itm/NETGEAR-N600-WIRELESS-DUAL...

You could even use something such as a homehub 3b I believe.

In reply to a post by muiscatron:

could the Airport Extreme be somehow limiting my speed?

Yes, it could be a good excuse to get the newer model with gigabit ports and dual 2.4 and 5ghz WiFi - they've been tested upto 400megabit throughput.