This Counter64 counts the number of times the L-bit (local fault indicator) in this pseudowire's CESoP/SAToP control word was set, signaling that this end detected a local TDM defect. Because this is the cumulative TdmPwTotalStatistics counter for the pseudowire, tallied since the bin's own start time rather than being reset every short collection interval, the L-bit is how this device tells the remote pseudowire endpoint that the TDM signal feeding into this end has a problem, so a rising Lbit count means the fault originates on this local TDM interface, not on the remote end or in the packet network. For example, if Lbit starts incrementing right when a local TDM cable was disturbed during maintenance, that timing confirms the fault indication is being generated locally rather than being caused by the remote site.