Multiplex communications – Wide area network – Packet switching
Patent
1988-05-20
1989-08-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082505, 370 89, H04J 300
Patent
active
048582328
ABSTRACT:
A switching system (10) configured in a ring topology (14) is disclosed. The system (10) causes one or more 125 microsecond isochronous frames (20) to circulate in the ring (14) at any given instant in time. A delay circuit (22) temporarily saves an oldest one of the isochronous frames (20) until a youngest one of the isochronous frames (20) has completed its transmission. Consequently, an integral number of isochronous frames (20) circulate in ring (14). The isochronous frame (20) is partitioned to support a random access tunnel channel (26) and a plurality of independently controlled cells (28), which provide a variety of deterministic access services. Each cell (28) contains a control field (30) that contains sufficient information to specify the type of switching service provided by the cell (28) and various service parameters. A time multiplexer (42) separates the tunnel channel (26) from the cells (28). A cell handler (46) separates individual ones of the cells (28) into individual service-specified channels. Other physical layer sections (44, 48-54) adapt these channels to a media access control layer's (56) requirements.
REFERENCES:
patent: 3919484 (1975-11-01), Mayemchuk
patent: 4002842 (1977-01-01), Meyr et al.
patent: 4306304 (1981-12-01), Baxter et al.
patent: 4627070 (1986-12-01), Champlin et al.
patent: 4713807 (1987-12-01), Cares et al.
Diaz Felix V.
Stanley Jack H.
DSC Communications Corporation
Olms Douglas W.
Scutch III Frank M.
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