This read-only INTEGER gives the byte offset, with one being the first byte, within the loopback packet where the lpbkErrorSent data begins, reset to zero at the start of each loopback operation. An admin uses this to know exactly where in the packet the corrupted bytes captured in lpbkErrorSent/lpbkErrorReceived are located. Knowing lpbkErrorOffset points near the end of a large test packet suggests the corruption is occurring toward the tail of long frames specifically.