MULTICAST INFORMATION DISTRIBUTION SYSTEM AND MULTICAST INFORMATION DISTRIBUTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a multicast information distribution system and a multicast information distribution method capable of ensuring required quality of information with a comparatively high capacity without giving adverse effect on reception of other information in the case of receiving distribution of the information from a network by multicast communication.

SOLUTION: Frames for a plurality of channels corresponding to multicast television programs or the like received from an uplink line 130 are subjected to a limit placed on an entire reception amount and a limit according to the priority and transmitted from a first priority control section 192, and an ATM SAR 134 receiving the resulting frames transmits them onto a back plane bus 128 as ATM cells. Each DSL subscriber line termination unit 127 references a local multicast distribution table 211 obtained on the basis of a global multicast distribution table 205, copies the required number of the ATM cells of a corresponding channel and transmits the ATM cells to a corresponding DSL line.

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