The value of tmnxOamMacPingHistoryOperStatus indicates the current
operational state of the SAP or SDP ID returned in response to a
'macPing' test. A value of 'true' indicates the SAP or SDP is
operationally 'up'.
The value of this object MUST be reported as 'false' when no ping
responses have been received or an active test has not yet timed out.