Note: The responsible party may also qualify a device intended to be marketed in a commercial, business or industrial environment as a Class B device, and in fact is encouraged to do so, provided the device complies with the technical specifications for a Class B digital device. In the event that a particular type of device has been found to repeatedly cause harmful interference to radio communications, the Commission may classify such a digital device as a Class B digital device, regardless of its intended use.
Note: The Domestic Public Cellular Radio Telecommunications Service is considered to be part of the switched telephone network. In addition, intercom and paging operations are permitted provided these are not intended to be the primary modes of operation.
Note: Computer terminals and peripherals that are intended to be connected to a computer are digital devices.
If the responsible party can demonstrate that because of price or performance the computer is not suitable for residential or hobbyist use, it may request that the computer be considered to fall outside of the scope of this definition for personal computers.
Where:
dslant is the slant-range distance, in meters (see Figure 1, below);
dh is the horizontal (lateral) distance between the center of the measurement antenna and the vertical projection of the overhead power line carrying the BPL signals down to the height of the measurement antenna, in meters;
hpwr_line is the height of the power line, in meters; and
hant is the measurement antenna height, in meters.
Dslant is the slant-range distance, in meters;
Dh is the horizontal (lateral) distance between the center of the measurement antenna and the vertical projection of the overhead power line carrying the BPL signals down to the height of the measurement antenna, in meters;
Dlimit is the distance at which the emission limit is specified in Part 15 (e.g., 30 meters for frequencies below 30 MHz);
Hpwr_line is the height of the power line, in meters; and
Hant is the measurement antenna height, in meters.
47 C.F.R. §15.3