This notification is generated when the pwOperStatus object for one or more contiguous entries in pwTable are about to enter the down(2) state from some other state. The included values of pwOperStatus MUST all be set equal to this down(2) state. The two instances of pwOperStatus in this notification indicate the range of indexes that are affected. Note that all the indexes of the two ends of the range can be derived from the instance identifiers of these two objects. For cases where a contiguous range of cross-connects have transitioned into the down(2) state at roughly the same time, the device SHOULD issue a single notification for each range of contiguous indexes in an effort to minimize the emission of a large number of notifications. If a notification has to be issued for just a single cross-connect entry, then the instance identifier (and values) of the two pwOperStatus objects MUST be identical.