The speed of electromagnetic waves is the limit of our perceptible speed. Planck units define its threshold.
Whereas gamma rays are the strongest waves and the fastest oscillating.
Information is radiated naturally, as well as communicated artificially. Nature participates the most in information radiation. Natural messages, which we receive, are not modulated signals.
Natural information dissemination occurs in three known ways. The cosmic signals we receive are either electromagnetic waves, or cosmic waves or gravitational waves. We know of no other signal.
Signal allocation in telecommunications using artificial electromagnetic waves was standardized by the former Consultative Committee on International Radio (CCIR). It has now been renamed. For example, television communication systems use signals between 30 MHz and 300 MHz.
