This is a running count of actual payload bytes transmitted outbound over the satellite interface. An admin uses this alongside cdmipWanFpgaActualWanTraffic to verify that reported outbound throughput matches what applications are actually sending, useful for confirming compression isn't inflating or deflating expected traffic volumes. For example, a customer claiming they're sending 1 Mbps of data but this counter implying only 400 kbps of payload transmitted would point to a LAN-side bottleneck rather than the satellite link.