The master continues to poll another slave while data comes into {TAIL ~ the slave} at {HEAD ~ time slot} 4 
The master continues to poll another slave while data comes into { TAIL ~ the slave } at { HEAD ~ time slot } 4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH