EPON Ethernet passive optical networks FTTB Fiber to the building FTTH Fiber to the home LLID Logical link identifier MPCP Multi-point control protocol MPCPDU MPCP protocol data unit OAM Operation administration and maintenance OAMPDU OAM protocol data unit OLT Optical line terminal ONU Optical network unit PON Passive optical networks RS Reconciliation sub-layer 乙太被動光網路 光纖線路 乙太網路