Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1995-08-23
1997-06-10
Olms, Douglas W.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370401, 370474, H04J 308, H04Q 1104
Patent
active
056383649
ABSTRACT:
In an ATM-LAN communication system, cell assembly disassembly (CLAD) units provide segmentation of a packet received from a LAN into payloads and assembling them into ATM cells, and disassembling received ATM cells into payloads and assembling them into a packet for transmission to the LAN. A connectionless switching function (CLSF) processor receives ATM cells either from an ATM switch and the CLAD units, and includes a database for storing address information of the received ATM cells and rotating the received ATM cells to the ATM switch and the CLAD units according to the address information of the database. The database has a destination address (DA) field, a VPI field and a VCI field. In response to an ATM cell, a source address, a VPI and a VCI contained in the cell are respectively stored into the DA, VPI and VCI fields of a database entry, and the database is searched for an entry having a DA field containing the source address of the received cell, a VPI field and a VCI field whose contents are different from the VPI and VCI of the received cell, and if such an entry is detected by the search, the VPI and VCI of the cell are rewritten with the different VPI and VCI to produce a transmit cell, and forwards the transmit cell to a destination. The database is further searched for an entry having a DA field containing the source address of the received cell. If the search fails to detect such an entry, the VPI and VCI of the cell are rewritten with broadcast VPI and VCI.
REFERENCES:
patent: 5280476 (1994-01-01), Kojima et al.
patent: 5450399 (1995-09-01), Sugita
patent: 5517497 (1996-05-01), Le Boudec et al.
patent: 5548589 (1996-08-01), Jeon et al.
NEC Corporation
Olms Douglas W.
Phillips Matthew C.
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