PN8625 and PN8626 series ONUs are integrated with an internal WiFi module, on which a WLAN in compliance with the IEEE 802.11 b/g/n standard can be established so that ONUs can receive/send PON signals and provide the radio network access function for terminals simultaneously.

Calibration is a mandatory step in production check for the WiFi module of each ONU. It mainly involves calibration of frequency offset and power. Chips, oscillators, and RF links are different by nature, so a dedicated instrument must be used for data calibration to ensure optimal ONU performance. The factory delivery calibration process is strictly implemented for the WiFi module of PN8625 and PN8626 series ONUs, and the WiFi module calibration data of ONUs in all production lines is recorded in the production system for quality tracing and control.