This field reports the version and revision identifiers baked into the second (backup/alternate) image of the Rx FPGA firmware running inside the CDD-564 satellite router. Because the unit keeps two FPGA images so it can fail over or be upgraded without bricking the receive path, comparing this string against the image-1 equivalent tells an admin whether both FPGA images are on the same build or whether image 2 is stale and due for a re-flash. A typical read might return something like 'Rev 3.2, Build 20110614', letting a technician confirm the image-2 FPGA matches the version deployed on other CDD-564 units in the same satellite network before switching cdd564BootImage over to it.