Indicates the status of the synchronous equipment timing subsystem.
If the tmnxSyncIfTimingRef1Qualified and tmnxSyncIfTimingRef2Qualified
are both set to 'not-qualified, then tmnxMDASyncIfTimingStatus is set
to 'not-qualified'. If any of the timing references is in use, then
tmnxMDASyncIfTimingStatus is set to 'qualified'.
tmnxMDASyncIfTimingStatus will be set to 'not-applicable' if this MDA
does not use the transmit timing subsystem.