Shared buffer asynchronous transfer mode switch

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header

Reexamination Certificate

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Details

C370S412000

Reexamination Certificate

active

06985486

ABSTRACT:
An asynchronous transfer mode switch includes a switching engine with a set of buffer groups having a set of 1-cell buffers where a cell is stored in only one buffer. The number of buffer groups exceeds the number of input ports. The switching engine also comprises a buffer management module, which includes a FIFO memory to maintain a pool of buffer groups that have at least one available buffer and memory to store bit maps for each buffer group and to store a CNT field value for each buffer to indicate which of its buffers are available to store a new cell, and which buffers still contain a cell that have not yet been read by its destination ports. The bit maps and CNT field values are updated during buffer allocation and buffer reads so that the FIFO maintains a current list of all buffer groups having available buffers.

REFERENCES:
patent: 5130982 (1992-07-01), Ash et al.
patent: 5636210 (1997-06-01), Agrawal
patent: 6151316 (2000-11-01), Crayford et al.
patent: 6501757 (2002-12-01), Kamaraj et al.

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