This Counter64, in bytes, reports the number of bytes the CDMA modem has transmitted specifically during the current, still-active connection. Unlike the lifetime total counter, an admin uses this per-connection figure to monitor real-time data usage of an ongoing session, useful for spotting an unusually data-heavy call in progress. For example, this counter climbing rapidly during what should be a lightweight monitoring session could reveal an unexpected large upload or a runaway process consuming the cellular link.