| 摘要 |
A multicast transmission method in GEM mode in Gigabit-capable passive optical network and a method of processing frames. The multicast transmission method includes the steps of: (a) setting a multicast connection; and (b) transmitting multicast messages in a GEM mode, wherein said step (a) includes a first sub step (i), in which predetermined ONTs are registered to a multicast group by means of IGMP frames in the first step, and a second sub step ( 11 ), in which an OLT assigns a multicast port ID to the multicast group and the ONTs registered to the multicast group. In addition, step (b) includes a first substep (i), in which the OLT assigns a multicast port ID to a message transmitted from a router to the multicast group, and transmits the message, and a second sub-step (ii), in which an ONT, which belongs to the OLT, filters the message, to which the multicast port ID is assigned, by means of a port ID assigned to the ONT.
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