o abort transmitted Station has transmitted an abort delimiter. o auto-removal failure Self-test failed following a beacon auto-removal process. o burst error Absence of transitions on the physical media. o frame copied error This station received a frame addressed to its MAC address with the A and C bits set. o internal error Station has detected an internal error. o line error CRC error or Manchester Violation detected in a token or frame with the E bit = 0. o lobe wire fault Short or open circuit detected on cable. o lost frame error TRR timer expired while this station was transmitting. o receive data overrun A receive overrun hardware error was detected. o remove received Remove ring station MAC frame received. o ring beacon initiated The station started the beacon process. o ring beaconing Beacon MAC frames being sent or received. o ring poll error Failure to properly set A and C bits during the ring poll process. o ring recovery Station is receiving or transmitting claim token MAC frames. o route discovery failure Route discover timer expired. o selftest failure The implementation specific self-test procedures have detected a failure. o signal loss Loss of signal on the physical media. o single station The only station participating in the ring poll process. o soft errors reported Soft error report MAC frame sent to ring error monitor. o station buffer unavailable No buffer was available to receive a frame. o token error This station, as active monitor, has had to transmit a new token following an error condition. o transmit failed Failure to transmit operation other than underrun. o transmit underrun Transmit failed due to underrun. o unrecognized individual pdu destination An individually addressed frame with unrecognized DSAP or protocol ID. o unrecognized multicast pdu destination A globally addressed frame with unrecognized DSAP or protocol ID. o user buffer unavailable Data link user did not supply a receive buffer.