It may be any type of link that is dynamically allocated in terms of {TAIL ~ bandwidth}, {HEAD ~ data rate}, modulation or otherwise 
It may be any type of link that is dynamically allocated in terms of { TAIL ~ bandwidth } , { HEAD ~ data rate } , modulation or otherwise
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH