By establishing a diagnostic link mode between the two modems, the systems and {HEAD ~ methods} of this invention are able to exchange {TAIL ~ diagnostic and test information} in a simple and robust manner 
are able to exchange
By establishing a diagnostic link mode between the two modems , the systems and { HEAD ~ methods } of this invention are able to exchange { TAIL ~ diagnostic and test information } in a simple and robust manner
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH