| 摘要 |
An OLT (Optical Line Terminal) having a multicast control unit, which controls connections dedicated for the multicast services, and a plurality of PON (Passive Optical Network) interfaces for accommodating subscriber terminals and each PON interface is provided with a unicast dedicated port for the unicast communication. When the multicast data packets are received at the multicast control unit, it identifies every PON interfaces as distribution destinations of those packets with referring to a pre-defined table and distributes first copied packets to respective identified PON interfaces. In each PON interface, it identifies every subscriber terminals as transmission destinations of the distributed multicast data packets with referring to another pre-defined table, and the second copied multicast data packets are multiplexed with the unicast data packets and transmitted to the subscriber terminals.
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