This object provides the text indicating the mismatches found in the APS PDUs exchanged between the near-end and the far-end switches. 'BbitMismatch' will be set when there is a mismatch found in the B bit of the received APS PDU. 'ConfigurationMismatch' will be set when an APS PDU is received through the working transport entity instead of the protection transport entity. 'LackOfResponse' will be set when there is a lack of response to a bridge request for a period greater than 50 ms (i.e., no match in sent 'Requested Signal' and received 'Requested Signal' for > 50ms). 'AbitMismatch' will be set when there is a mismatch found in the A bit of the received APS PDU. 'DbitMismatch' will be set when there is a mismatch found in the D bit of the received APS PDU. 'RbitMismatch' will be set when there is a mismatch found in the R bit of the received APS/PSC PDU.