llidOnuBindDistance is an integer reporting the measured distance associated with an LLID-to-ONU binding, per the MIB's terse "LLID & ONU binding Distance" description. Admins use this value, which reflects the ranging distance the OLT calculated for that ONU over the fiber, to gauge how far a subscriber's ONU is from the OLT and to sanity-check fiber plant topology. For example, an unexpectedly large distance value for an ONU expected to be close to the OLT could indicate the signal is looping through a longer-than-expected fiber run or splitter chain.