This object is used to control the switchover of protected channels. 'unlock (1)' : Transition state to unlock. A channel which is in lock state has to be brought to 'unlock (1)' state for it to be available for switchover. Whether a switchover to a channel is allowed or not is dependent on both vismChanActivityState and vismChanLockingState. A switchover is allowed if its vismChanActivityState is standby and its vismChanLockingState is unlock. Changing the vismChanLockingState to unlock does not cause a change in the vismChanActivityState. A channel which is in unlock state may carry traffic depending on its activity state (active or standby). 'lock (2)' : Transition state to 'lock (2)'. If the activity state is active, it transitions to standby and a switchover occurs to another channel which is standby and 'unlocked (1)'. When a channel is in 'lock (2)' state, switchover to this channel is not allowed. A channel which is in 'lock (2)' state, is always in either standby or failed state. Hence it will not carry any traffic. Switchover to a channel which is in 'lock (2)' state is not allowed. This object can be set to 'locked (2)' to force a switchover and/or to perform maintenance operations related to that channel. A channel that is 'unprotected' will always be in 'unlock (1)' state. It can not be set to 'lock (2)' state.