High-speed ring LAN system

Details High-speed ring LAN system High-speed ring LAN system

1989-08-29

1992-04-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04J 302, H04J 324, H04L 1242

Patent

active

051034476

ABSTRACT:
A high-speed ring LAN capable of accommodating at least one public network having a signal transmission rate of 155.57 MHz, and at least one sub-LAN having a signal transmission rate of 100 MHz. The high-speed LAN has a signal transmission rate of 155.52 Mbps.times.n (n is an even number). SONET (Synchronous Optical NETwork) subframes each comprising a 9 bytes.times.9 section overhead area and a 261 bytes.times.9 virtual container 4 (VC-4) area flow in a time-divisional n-multiplexed format. The respective node devices inserted in the transmission path have one or more ports to accommodate sub-LANs or public networks. Information is exchanged in units of a fixed-length packet between a received SONET subframe and an asynchronous packet whereas information is exchanged in units of a byte between the SONET subframe and a synchronous port.

REFERENCES:
patent: 4569041 (1986-02-01), Takeuchi et al.
patent: 4685105 (1987-08-01), Shikama et al.
patent: 4779261 (1988-10-01), Yamagishi et al.
patent: 4809267 (1989-02-01), Higuchi et al.
patent: 4817088 (1989-03-01), Adams
patent: 4866704 (1989-09-01), Bergman

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