The master reference signal can be one of {TAIL ~ the signals} being output by the transmitting device, {HEAD ~ an internal signal} that is representative of the desired placement of the edges, or an external signal received by the transmitting device 
The master reference signal can be one of { TAIL ~ the signals } being output by the transmitting device , { HEAD ~ an internal signal } that is representative of the desired placement of the edges , or an external signal received by the transmitting device
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH