The value of tmnxOamAtmPingCtlLpbkLocation specifies the Loopback
Location ID used in the ATM OAM loopback cell. If all bits in the
Loopback Location ID are '1', the destination of the OAM ATM ping
is the far-end destination of the VC. Otherwise the cell is destined
to a specific ATM node in the ATM network.
This is an optional parameter.