This Counter64, in bytes, tracks the total amount of data the CDMA modem itself has received across all calls, again distinct from bytes received at the router's interface level. An admin tracking data usage against a carrier's monthly cap would rely on this modem-reported figure since it reflects actual over-the-air data volume rather than just what reached the router's IP stack. For example, an admin nearing a data cap might poll this counter regularly to project when the site will exceed its plan's allowance.