FCC Part 15 Modular Certification Rules Baseline Guidelines
FCC Part 15 modular rules allow pre-certified radios in host devices provided shielding, power regulation, labeling, and antenna limits match grant guidelines.
Host Evaluation
Meaning
Host evaluation designates the verification process wherein an integration board assesses the operational parameters and peripheral status of a connecting radio module. This procedure governs the interface boundaries between the primary processing unit and the attached communication hardware during initial boot sequences. The verification protocol stops applying once the physical link transitions to normal packet routing and dynamic link management.
Interface Verification
Communication protocols require strict synchronization between the host processor and the attached cellular modem before data packets cross the board edge. Voltage thresholds on the serial bus must match the operational limits specified in the hardware datasheet to prevent logic gate degradation. Thermal sensors mounted near the radio frequency amplifier feed continuous temperature readings back to the main processing unit during high power transmissions.
Operational Compliance
Regulatory standards mandate that testing laboratories record spurious emissions while the primary board drives the modem at maximum duty cycles. Shielding cans placed over the transceiver chip attenuate electromagnetic interference to protect adjacent digital traces from corruption. Firmware routines inside the master microcontroller monitor clock jitter to ensure compliance with radio frequency allocation laws.
Integration Threshold
Signal attenuation across the coaxial cable connecting the onboard transceiver to the external antenna connector must remain below specific dB losses to preserve receiver sensitivity. Power delivery networks must maintain stable voltage levels during sudden current spikes caused by power amplifier activation. Engineers verify these electrical margins against published component specifications during the final design review before releasing the assembly for volume manufacturing.