G - Physics – 06 – F
Patent
G - Physics
06
F
354/236
G06F 13/38 (2006.01) G06F 13/12 (2006.01) G06F 13/42 (2006.01)
Patent
CA 1320004
ABSTRACT OF THE DISCLOSURE There is disclosed a data communications link adapter providing flow of data control and status information between an input/output (I/O) Backplane and a fiber opticFrontplane. The adapter represents a melding of I/O channel extender technology and data communications technology: a dedicated processor handles link layer protocol, leaving to software only higher protocol layers; a flow-through architecture is provided by the adapter; a combination of windowing and handshaking are used; and a relatively short frame of sixteen bytes is employed. The adapter includes a backplane adapter portion which serves to interconnect host equipment, a processor portion dedicated to layer 3 (circuit operations), a protocol controller dedicated to layer 2 (physical layer) operations, a fiber optic interface portion dedicated to layer 1 (physical link) operations, and an arbiter portion which couples the processor to a data path connecting thebackplane adapter and the protocol controller. The arbiter controls data accesses that use a portion of the data path connecting the backplane adapter to the protocol controller and a data path between the protocol controller and the processor. A variety of data integrity measures are implemented on all data paths. The adapter facilitates data f low-through by buffering internal to the protocol controller, and has extensive data flow control features.
589354
Haagens Randolph B.
Keaveny Thomas A.
Hewlett-Packard Company
Sim & Mcburney
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