Multiplex communications – Wide area network – Packet switching
Patent
1992-01-13
1993-09-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, 370 942, 370 55, H04L 1242, H04L 1256
Patent
active
052475182
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 port 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: 4716561 (1987-12-01), Angell et al.
patent: 4809267 (1989-02-01), Higuchi et al.
patent: 4858232 (1989-08-01), Diaz et al.
Amada Eiichi
Hiyama Kunio
Suzuki Taihei
Takiyasu Yoshihiro
Tanaka Toshiki
Hitachi , Ltd.
Kizou Hassan
Olms Douglas W.
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