In my area I only have the option of DSL or satellite. DSL is a lot less expensive.

In the past few month the connection speed has been dropping throughout the day. if I reboot my modem I get full speed for a while.

I have changed my modem. I have run a new cable from the DSL modem to the phone Demarc. The speed continues to drop.

What things can I check to try and determine if the problems is on my side of the demarc or if it is on the carrier side?