This is the DCE-side counterpart to lportDTEPollErrorCounts, counting reliability errors in the DCE's in-channel signaling, specifically timeouts waiting for expected Status Enquiry polls from the DTE, or sequence-number mismatches, since the last reset. An admin watches this to gauge LMI health from the network side, distinguishing a customer device that stopped polling from physical-layer problems. For example, a steady rise in lportDCEPollErrorCounts with no corresponding physical-layer alarms suggests the connected DTE device has stopped or slowed its LMI polling cadence.