This reports the raw current values of the SONET K1 and K2 overhead bytes received on the protection channel, which together carry the actual APS protocol signaling (switch requests, channel number, architecture and direction indicators) coming from the far end. An admin decoding this value directly sees exactly what protection-switching request or status the far end is currently signaling toward this device, which is the ground truth for diagnosing APS coordination problems like mode mismatches or channel mismatches. For example, if the far end is requesting a forced switch, the K1 byte's Type-of-Request bits within this value would decode to that specific request code, which an admin can compare against what this device's own settings expect.