| 摘要 |
An ATM destination switch (130) comprising an ATM layer device which includes an ATM layer interface (135), a processor (136) with an associated translation RAM (162), and an ATM layer to physical layer interface. The processor decodes incoming ATM cell to obtain a VPI/VCI, and provides additional routing information to the cell for multicasting. The cell with the additional routing information is forwarded to the physical layer device which has a header processor (160), a multicast indicator storage table, in the form of a bit map for storing output line indications and ATM line output interfaces (170). The header processor (160) receives the cell with the additional routing information, reads the routing information, accesses the multicast indicator storage table based on the routing information to determine which output lines the cell is to be provided, and controls the copying of the cell for each output lines so that it may be received at multiple destinations. Thus, an incoming cell which is to be multicast to multiple users will be multicasted using the single VPI/VCI.
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