This counts reliability errors specific to the DTE's in-channel LMI signaling, such as Status Enquiry frames that got no response or sequence-number mismatches in the responses that did arrive, since the last system reset. An admin uses this as the aggregate LMI-health counter for the DTE side, feeding into whether lportDTEFailCounts eventually increments once errors exceed the configured threshold. For example, a steadily rising lportDTEPollErrorCounts even while the physical circuit shows no CRC errors would point specifically at LMI-layer signaling trouble, not a wiring or framing problem.