This read-write value sets the maximum number of LMI Status Enquiry polls, parameter N4 under LMI Rev 1, the DCE will accept from the DTE within the time window defined by lportDCEnT3, and it only applies when the port is running the LMIREV1 signaling standard. An admin tunes N4 and T3 together to detect a DTE that is polling abnormally fast, which could indicate a misconfigured or malfunctioning router, without false-flagging normal polling behavior. For example, setting lportDCEnN4 to 5 within a lportDCEnT3 of 60 seconds means the DCE will flag the DTE if it sends more than 5 Status Enquiry frames inside any 60-second window.