These types of questions can get many different responses and opinions from many different users. I am no lawyer, but here is my take on it:
FCC 97.113.5 states that "No amateur station shall transmit...Music using a phone emission except as specifically provided elsewhere in this section; communications intended to facilitate a criminal act; messages encoded for the purpose of obscuring their meaning, except as otherwise provided herein; obscene or indecent words or language; or false or deceptive messages, signals or identification."
With that, what is the FCC's definition of a "phone emission?" In FCC Part 97.3(c)(5) it states "The following terms are used in this part to indicate emission types: Phone. Speech and other sound emissions having designators with A, C, D, F, G, H, J or R as the first symbol; 1, 2 or 3 as the second symbol; E as the third symbol. Also speech emissions having B as the first symbol; 7, 8 or 9 as the second symbol; E as the third symbol. MCW for the purpose of performing the station identification procedure, or for providing telegraphy practice interspersed with speech, incidental tones for the purpose of selective calling or alerting or to control the level of a demodulated signal may also be considered phone.
So with that, what type of emission is 802.11g? According to Cisco's documentation, 802.11g uses OFDM (Orthogonal Frequency Division Multiplexing), Documentation. So what is OFDM? What's its emission type? Wikipedia (as much as I try to stay away from them) has a good article. Acording to Digi, OFDM, DSSS has an emission designation of 16M8GXW.
What does 16M8GXW mean? Take a look at this article for the FCC's emission designation definitions. And remember what was mentioned earlier? A phone emission is that which has "designators with A, C, D, F, G, H, J or R as the first symbol; 1, 2 or 3 as the second symbol; E as the third symbol. Also speech emissions having B as the first symbol; 7, 8 or 9 as the second symbol; E as the third symbol."
Since 16M8GXW doesn't have an A, C, D, F, G, H, J or R, a 1, 2, or 3 nor an E as the thrid simbol (and likewise with the "Also speech emission..." part), OFDM is not a phone emission. This means that 97.113, "No amateur station shall transmit...Music using a phone emission except as specifically provided elsewhere in this section." does not apply to OFDM and therefore we can send databit across the mesh that are interpreted by the VoIP phones as electrical waveform that command the phone speaker to make the sound, or "music" we hear. |