As described previously, {TAIL ~ the UP} 503 operates in isochronous mode in one embodiment in which the data stream to the subscriber location 105 is maintained at the appropriate rate to ensure {HEAD ~ proper operation} of the CPE at the subscriber location 105 
As described previously , { TAIL ~ the UP } 503 operates in isochronous mode in one embodiment in which the data stream to the subscriber location 105 is maintained at the appropriate rate to ensure { HEAD ~ proper operation } of the CPE at the subscriber location 105
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