They are two separate boxes.
I tried http://reviews.cnet.com/internet-speed-test/
Getting slow as heck readings directly through the modem.
Unplug the DSL modem and, if it’s a modular plug, also unplug it from the telco side. Wait at least 1 full minute and plug it all back in again. Direct-connect the PC to the DSL modem and try the speed test again.
If it’s still slow, swap the ethernet cable for a different one (the one between the PC and the DSL modem) and test again. This is just to be sure you don’t have a bad cable (extremely rare).
If still slow, try the direct-connect from a different PC and test again. This will either eliminate the PC as the cause, or confirm that you have a PC problem.
If still slow at this point, then you need to call your DSL provider. They should be able to help diagnose remotely, including line checks, clearing the line, etc.
Sounds like you've found the issue, then. (We'll, at least you know it's somewhere from the modem on back to the phone company).
I, unfortunately, found that I've got an issue inside the walls in my manufactured home. Probably chewed on by mice. Right now, I have a phone cable running from the phone company box outside my back door, across my kitchen floor, into my DSL modem. It's an eye-sore and a tripping hazard but my Internet service doesn't drop out every 5 minutes. I'll eventually have to run a new cable through the walls.