This read-only counter tracks the number of PVC hello PDU frames received in the VC entry of the called side for this leaf, i.e., keepalive/handshake messages received by the side that answered the call. Hello PDUs are typically part of a PVC's connection-verification handshake, so this counter's rate of increase indicates whether the calling side is actively and successfully sending periodic hellos to maintain the connection. An engineer diagnosing a leaf that intermittently drops would check whether cktLeafHelloCounter is incrementing at the expected steady rate or has stalled, which would point to a hello-based keepalive failure preceding the drop.