Upon detection of a trigger, such as {HEAD ~ the exceeding} of {TAIL ~ an error threshold} or the direction of a user, a diagnostic link system enters a diagnostic information transmission mode 
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Upon detection of a trigger , such as { HEAD ~ the exceeding } of { TAIL ~ an error threshold } or the direction of a user , a diagnostic link system enters a diagnostic information transmission mode
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH