Local area network data processing system containing a quad elas

Details Local area network data processing system containing a quad elas Local area network data processing system containing a quad elas

1993-11-15

1995-08-15

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 582, 370 855, H04L 12417

Patent

active

054426286

ABSTRACT:
An integrated circuit for use in fiber data distributed interface (FDDI) system has four elastic layer and buffer management (ELM) circuits (12, 14, 16, and 18) coupled through a crossbar switch (20). The crossbar switch (20) allows any of the ELM circuits (12, 14, 16, and 18) to be coupled to any other ELM circuit (12, 14, 16, or 18) or to one of three external buses for FDDI communication. By using a crossbar switch and four ELM devices on a single integrated circuit, FDDI performance is improved while system design is made easier and more flexible than previously possible. Cipher circuitry (22, 24, 26, and 28) is used to scramble and descramble data ingoing and outcoming from the ELM devices. Concentrators, workstations, local area networks (LANs), and the like may incorporate the circuit (10) to improve performance and flexibility.

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