This Counter32 counts the number of AAL5 PDUs transmitted to the network on this channel, applicable to PVCs configured as AAL5, VoIP, or CCS PVCs in VoAAL2 applications. Because it only increments for these specific PVC types, an admin can use it to confirm that a signaling or VoIP-over-AAL5 PVC is actually pushing packets rather than sitting idle. For example, on a CCS signaling PVC carrying D-channel traffic, a stalled vismChanAal5PduSentPkts count would indicate the signaling link has stopped transmitting even if the physical layer looks up.