Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1996-04-26
1999-06-29
Jung, Min
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370392, 370395, 370397, 370419, H04L 1256
Patent
active
059178191
ABSTRACT:
Improved methods and apparatus are disclosed for remapping Asynchronous Transfer Mode ("ATM") cells in an ATM switch to convert a single Virtual Path Identifier ("VPI")/Virtual Connection Identifier ("VCI") address pair to multiple outgoing VPI/VCI pairs for multicast transmission. An incoming cell is examined to determine the ports through which the cell will exit and a local header is generated which includes a field specifying the I/O modules ("IOMs") through which the cell will exit. The VPI/VCI pair of an incoming multicast cell is mapped to a global multicast identifier ("MID") which is written into the local header. The cell, including the local header is then forwarded to the IOMs specified in the header. A first lookup table on each IOM is employed to provide a port bitmask indexed by MID to direct the cell to the previously identified ports, and to map the MID into a connection identifier ("CID"). A second lookup table is employed to map the CID provided from the first table to a destination VPI/VCI. The second table is shared among all ports on the IOM. Memory utilization efficiency is improved by using global MIDs and by distinguishing multiport-multicast cells from single-port-multicast cells. If the cell is being sent to a single port within the IOM then a single location is allocated in the second table. If the cell is being sent to multiple ports within the IOM then multiple locations are allocated within the second table.
REFERENCES:
patent: 5274641 (1993-12-01), Shobatake et al.
patent: 5305311 (1994-04-01), Lyles
patent: 5323389 (1994-06-01), Bitz et al.
patent: 5325356 (1994-06-01), Lyles
patent: 5327420 (1994-07-01), Lyles
patent: 5392402 (1995-02-01), Robrock, II
patent: 5394397 (1995-02-01), Yanagi et al.
patent: 5400325 (1995-03-01), Chatwanti et al.
patent: 5408469 (1995-04-01), Opher et al.
patent: 5420858 (1995-05-01), Marshall et al.
patent: 5436893 (1995-07-01), Barnett
patent: 5457687 (1995-10-01), Newman
patent: 5473679 (1995-12-01), La Porta et al.
patent: 5479401 (1995-12-01), Bitz et al.
patent: 5483526 (1996-01-01), Ben-Nun et al.
patent: 5592476 (1997-01-01), Calamvokis et al.
patent: 5666361 (1997-09-01), Aznar et al.
patent: 5671222 (1997-09-01), Chen et al.
patent: 5684797 (1997-11-01), Aznar et al.
patent: 5689506 (1997-11-01), Chiussi et al.
patent: 5701300 (1997-12-01), Jeon et al.
Goss Gregory
Hebb Andrew T.
Malloy Phil
Yang Bing
Cascade Communications Corp.
Jung Min
LandOfFree
Remapping of ATM cells for multicast transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Remapping of ATM cells for multicast transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Remapping of ATM cells for multicast transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1382587