This reports the revision level of the software that was downloaded, as opposed to running from PROM, onto this node, applicable to 6500 platforms. Since this node can run either PROM-resident or downloaded code, per cdx6500NMNPIsoftwareSrc, this is the specific version number an admin checks to confirm a software push to the downloadable code actually landed the intended version, separate from the PROM revision which requires a different upgrade process entirely. For example, after pushing a downloaded software update intended to bring the node to revision 4.2, this object should read 4.2 to confirm the download succeeded and is active.