Switchcore, A.b.

Patrik Sundstr&ouml;m

Jonas Alowersson

Per Andersson

Bertil Roslund

The invention relates to a buffer memory, method and a buffer controller for queue management usable in an ATM switch. An object of the invention is to achieve a high frequency throughput of data cells in the buffer memory. This object is achieved by using a buffer memory which is organized as 256*(424&plus;8) SRAM-cells. The memory is used for holding ten queues, one for each incoming channel and two free-queues containing idle cells.

Queue management system having one read and one write per cycle by using free queues

The invention relates to a method and an arrangement for multicasting, i.e. point to multipoint transmission of a data packet. A packet is copied and transmitted to multiple addresses. In the multicasting arrangement, switch core and input and output port are connected to input and output links, respectively, for transmitting data packets. According to the invention, the input port is adapted to detect a multicasting packet received on an input link or from an output port and send the multicasting packet to an output port. The output port is adapted to detect the multicasting packet, copy the data packet, modify an address portion of the multicasting packet, send one packet on the output link and return one packet with the modified address portion to an input port. Preferably, the input port and the output port are integrated in a link interface having a direct channel for returning the data packet. The present invention improves the efficiency of multicasting by distributing copying of the data packets on several output ports of the switch core (e.g. an ATM switch).

Growing community of inventors

Osby, Sweden

Patrik Sundström

Growing community of inventors

Osby, Sweden

Patrik Sundstr&ouml;m

Patrik Sundström