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.