A capacity monitor can monitor {HEAD ~ capacity related conditions} of {TAIL ~ a data port}, including bandwidth usage and reservation conditions 
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A capacity monitor can monitor { HEAD ~ capacity related conditions } of { TAIL ~ a data port } , including bandwidth usage and reservation conditions
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH