When the error between {TAIL ~ the detection level signal} SRL and the predetermined level value LREF falls within the permissible range, that is, no substantial error exists , {HEAD ~ the correction controller} 105 outputs a transmission permission signal to the transmission controller 106  
When the error between { TAIL ~ the detection level signal } SRL and the predetermined level value LREF falls within the permissible range , that is , no substantial error exists , { HEAD ~ the correction controller } 105 outputs a transmission permission signal to the transmission controller 106
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH