| 摘要 |
An OLT system for providing a quality-guaranteed multicasting service, a switch device thereof, and a multicast service method thereof are provided to classify multicasting packets for IP(Internet Protocol) broadcasting, inputted to the OLT system, and use a virtual traffic class capable of setting a parameter for a differentiated service and a traffic class for re-mapping, which is bound to an output port. An OLT(Optical Line Terminal) system comprises the followings: a switch(110) which makes an inputted multicasting packet mapped to a virtual traffic class, assigned to a main processor(100), if a multicasting packet is inputted, and makes the multicasting packet, mapped to the virtual traffic class, re-mapped according to traffic class information for re-mapping of a corresponding traffic class, and outputs the remapped multicasting packet; a line card(120,130) which receives information about whether to participate in a corresponding multicasting group from a subscriber terminal and outputs the multicasting packet, switched in the switch(110), to the subscriber terminal through an output port bound to the corresponding traffic class for remapping; and a main processor(100).
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