Optical Spectrum Analyzers (OSA) – Measure laser wavelength, side-mode suppression, and optical power. Bit Error Rate Testers (BERT) – Verify error performance under full data load. Functional Debugging Commands Reference In this context, PHY can be understood as an optical module. When testing PRBS, there are 3 test nodes: MAC ----> PHY, PHY -----> MAC, and PHY ----- PHY. Example:. • Compare the issue across several devices or PCBs to ensure that the issue is not a one-off case. • Try using an alternative link partner or test equipment and then compare results. Perform these additional checks. The invention discloses an optical module debugging system, which comprises a debugging board, a debugging communication mainboard and a debugging host machine, wherein the debugging board comprises a differential crystal oscillator which is used for providing data electric signals for a debugged. The anti-rogueont command detects rogue optical network terminals (rogue ONTs). Specifies the type and number of an interface. Try putting the core into loopback (both by placing the core into internal loopback, and by looping back the optical. In compact MSA (Multi-Source Agreement) form factors such as QSFP-DD and OSFP, high-speed DSP, drivers, TIA, MCU, and precision optical components are tightly integrated.