The value of tmnxEthRingCompatibleVersion specifies the backward
compatibility logic for the Ethernet Ring.
If this object is set to 'version1 (1)' then:
1. Attempts at setting tmnxEthRingCommandSwitch to the value
'forceSwitch (2)' or 'manualSwitch (3)' will result in an
inconsistentValue error, and
2. Attempts at setting tmnxEthRingRevertTime to the value zero (0)
will result in an inconsistentValue error.
If this object is set to 'version2 (2)' then the above restrictions
will not apply.