This object is used in decoding 'mepUp' and 'mepDown' events. ** For 'mepUp', the following codes are relevant: 'new' - This is the very first time the device receives a CC message from the remote MEP. 'returning' - The device received a CC message from a remote MEP for which it had an expired CCDB entry. 'portState' - The device received a CC message from a remote MEP for which it has a valid CCDB entry, and the message indicates a port status change. ** For 'mepDown', the following codes are relevant: 'lastGasp' - The device received a CC message from a remote MEP with zero lifetime. 'timeout' - The local CCDB entry for the remote MEP expired. 'configClear' - A previous CC message from a MEP that triggered a configuration error event is cleared. 'loopClear' - A previous CC message from a MEP that triggered a loop error event is cleared. 'xconnectClear' - A previous CC message from a MEP that triggered a crossconnect error event is cleared. 'unknownClear' - A previous CC message from a MEP that triggered an unknown MEP event is cleared.