BT1 signaling typically involves {TAIL ~ bandwidths} that are of {HEAD ~ a fixed size}, in this case occupying one frequency channel 
BT1 signaling typically involves { TAIL ~ bandwidths } that are of { HEAD ~ a fixed size } , in this case occupying one frequency channel
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH