| 摘要 |
A DISTRIBUTED DSLAM, WHICH COMPRISES A HEAD END SUBSYSTEM (102) LOCATED WITHIN A SWITCHING FACILITY (114) AND A REMOTE SUBSYSTEM (104) LOCATED OUTSIDE OF THE SWITCHING FACILITY (114). THE HEAD END SUBSYSTEM (102) IS OPERATIVE FOR ROUTING STREAMS OF DATA FROM A DATA NETWORK (120) TO THE REMOTE SUBSYSTEM (104) OVER A COMMUNICATION LINK (112), WHILE THE REMOTE SUBSYSTEM (104) IS OPERATIVE FOR TRANSMITTING OVER A SET OF LOCAL LOOPS (110) ANALOG SIGNALS COMPRISING DIGITALLY MODULATED VERSIONS OF THE DATA. SEPARATING THE ROUTING AND MODEM FUNCTIONALITY BETWEEN INSIDE AND OUTSIDE PLANT FACILITIES REDUCES HEAT DISSIPATION IN THE OUTSIDE PLANT, LEADING TO INCREASED RELIABILITY. FLOW CONTROL CAN BE PERFORMED IN THE UPSTREAM AND DOWNSTREAM DIRECTIONS BY TRANSMITTING PORTIONS OF INDIVIDUAL PACKETS AND WITHHOLDING OTHER PORTIONS OF INDIVIDUAL PACKETS. THIS IS DONE INSTEAD OF WITHHOLDING THE TRANSMISSION OF ENTIRE PACKETS. AS A RESULT, THE PERCEIVED IMPACT ON VIDEO QUALITY, FOR EXAMPLE, IS LESSENED.
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