An earth overfilled arched structure includes a shallow arch spanning a clear space. The location of failure can thus be specified accurately. In certain embodiments, the CPE device may be configured to function as a media server device andor as an intermediary technical support device at a customer premises. A user-specific blocked list or identified junk sender list is published at a server of a computing network, so when a new e-mail arrives, the server can automatically apply filtering rules based on the user-specific junk sender list and delete the appropriate messages. Preferably, in initializing the equalizer, the relation 11+FG=His obeyed where G is the forward FD equalizer taps, F is the Fast Fourier Transform of the feedback TD equalizer taps, and H is the estimated response of the communications channel.