A non-zero value indicates that signalling was received with the wrong MAC address or a mismatched link name. NB: It is very unusual to detect this, because units with mis-configured Target MAC Address will normally fail to establish a wireless link. However, rare circumstances may establish a partial wireless link and detect this situation. NB: A non-zero value on start-up, or a change of value during operation, may generate an SNMP trap and/or SMTP email alert