Teletom;
Your analogy of a "pipeline" is quite correct. Part of a problem can be the length of the pipeline, bifurcations along the way, and how many other users are along the way in front of you. Our expensive B&O A/V equipment is only as good as the signal strength it receives.
When the Beoport came to the market, I was an early buyer. However, I could not get the N.RADIO signal to hold, and experienced frequent dropouts. After checking my system, and the strength of the radio broadcast signals, I then checked the line itself.
I found the line itself was very old, corroded, and being up a hill, 1000 M from the junction box in the street, I was fortunate to receive anything. A few calls and a letter documenting the problem resulted in a verified signal-test ( poor to zero ) and a new high-speed replacement line being pulled.
Voila ! Everything improved: VOIP, Internet, HD film downloads, etc.