Evaluating Class II Permissive Change Triggers during Host Integration
Modular host integration triggers a Class II Permissive Change whenever trace redesigns, antenna swaps, or co-location alter SAR or radiated emissions profile.
Power Tables
Meaning
Structured dataset stored in non-volatile memory defines the maximum allowable transmitter output across different frequencies, modulations, and operational states. These structured settings, called power tables, dictate the RF output limits of a wireless module during active communication. They ensure the device maintains regulatory compliance with local emission limits while maximizing connection quality.
Firmware Configuration
Engineers write these target values into the module during the final production line testing or flash them as part of the system firmware image. The power tables contain detailed indices for every combination of operating band, data rate, and antenna configuration. When a module switches from a high-speed data state to a low-latency voice state, the onboard processor queries these tables to adjust the gain of the power amplifier dynamically.
This precise tracking prevents the transmitter from overshooting the safe thermal and regulatory limits for the selected channel.
Compliance Limit
Different regions of the world require unique limits to comply with local electromagnetic exposure and interference standards. For example, a wireless device sold in Europe must follow different power tables than the same physical device operated in North America. Regional profiles are activated during device provisioning based on mobile network codes or localized geolocation services.
Calibration Procedure
Production calibration compares the measured output of each individual device against the reference limits in the tables. Software then generates a set of offset values to compensate for component variations in the RF front-end circuitry. This correction ensures that every shipped device operates at the designed power level without violating safety boundaries.