Are you in a single tenant structure? You should have a separate demarc if you are the only one who lives in your building. Even if there is a few tenants, you still have have your own demarc on the back of your house. (Could be in the basement,too). I am not talking about the green pedistals that you see out by the curb.
If you do have your own Demarc, As a customer, you are allowed to open your side of the box of perhaps the whole box. If you need special tools, you are trying to open up the telco side and that is bad. You should just need a screwdriver.
If you live in a big apartment building or town home complex, your DMARC is probably locked up in the basement, somewhere.
Even though you live in a new house, doesn't mean you don't have problems. You could have a telephone or some other telephony device bringing in interference or otherwise degrading the quality of the phone line. That is why I suggested disconnecting all your phone devices. Also, A very popular wiring scheme for new houses is to start at the demarc with a spool of telephone wire and then run a single run to all jacks, daisy chaining them like Christmas lights. So if you have a bad connection at one jack, it effects the line of all jacks upstream.
You could probably get the phone company to come check it providing you are willing to pay them extra. In there eyes, you are getting what you pay for and more than likely, will not help you get better service with out charging you for the service call. If they do come up you may be able to have them unhook your house form the line and connect a temporary dedicated run for your PC or maybe use your PC or Laptop right at the demarc.
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