usdAtmVpPingSentProbes 1.3.6.1.4.1.4874.2.2.8.1.5.2.1.4

The number of ping probes (OAM cells) that have been sent thus far for this test. The value of this object MUST be set to zero when the atmfM4VpTestStatus object transitions from notInUse(0) to inUse(1).