| 摘要 |
<p>Multicast communication frames for a plurality of channels corresponding to television programs and so on received from an uplink line 130 are subjected to limitation with respect to a total reception amount or limitation according to priorities and sent out from a first priority control section 192 , then forwarded onto a backplane bus 128 as ATM cells from an ATM SAR 134 . DSL subscriber line termination units 127 refer to their own local multicast distribution tables 211 obtained on the basis of a global multicast distribution table 205 to thereby duplicate as many copies of the ATM cells of the channels concerned as required and send them to corresponding DSL lines.</p> |
