This is the lifetime outbound packet total for the pseudowire, running continuously since the last discontinuity rather than resetting every 15 minutes like the interval counters. Engineers compare this against cpwVcPerfTotalInHCPackets to spot a persistent traffic asymmetry on a VC that's supposed to be roughly symmetric, such as a connection sending far less than it receives due to a one-sided application flow. A pseudowire showing an outbound total barely a tenth of its inbound total over a long uptime is worth investigating for a possible routing or NAT issue upstream.