Asynchronous transfer mode switch with multicasting ability

Details Asynchronous transfer mode switch with multicasting ability Asynchronous transfer mode switch with multicasting ability

1995-04-13

1996-11-05

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

370 61, 370 942, H04L 1256

Patent

active

055725228

ABSTRACT:
An ATM switch with multicast capability is provided that internally uses input and output identifiers to identify the cell input and output streams, the relevant input identifier being generated for each cell as it arrives. The apparatus stores both the cell bodies of the cells received by the input means and a respective sequence data set for each input stream. Each sequence data set serves to order the cell bodies received for the corresponding input steam in order of receipt. The sequence data sets are held in a queuing block that includes an input control which upon a new cell body being stored, updates the sequence data set of the input stream to which the cell belongs as identified by the corresponding input identifier. The queuing block also has an output control for maintaining for each output stream a sequence position indicator referencing into the sequence data set of the corresponding input stream to indicate the next cell body to be sent on the output stream concerned. A scheduling block of the apparatus outputs the output identifier of the output stream on which a cell is next to be output. This identifier is used by the output control of the queuing block to look up the corresponding sequence position indicator which it uses, in turn, to reference into the corresponding sequence data set thereby to identify the cell next to be sent on the scheduled output stream. The same queuing arrangement can also be used in systems handling variable-length packets.

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International Journal Of Digital And Analog Communication Systems, vol. 5, 1992 -Chichester, GB pp. 29-37.

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