This OID stores the high-order portion of a 64-bit counter that tracks how many cells have been successfully decoded on side A of a Frame Relay PVC, with the value ranging from 0 to 2,147,483,647 for this segment alone. A network engineer would monitor this to ensure that cells are being properly converted back from ATM format on the A-side endpoint, especially after circuit changes or equipment replacement. For example, a value of 1,500,000 in this field combined with the low-order counter would indicate roughly 1.5 billion cells decoded since the interface came up.