Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2007-02-20
2007-02-20
Nguyen, Hanh (Department: 2668)
Multiplex communications
Diagnostic testing
Fault detection
C370S217000, C370S248000, C370S250000
Reexamination Certificate
active
09748419
ABSTRACT:
A methodology is provided for fault detection and service restoration in a multiservice switch on a per flow basis. An ingress source transmits the same data over each of two redundant cores. An egress receiver selects on a per flow bass which core to utilize. Bi-directional flows are not necessarily grouped together. The basic approach to fault detection is to assume that the two cores are not in lock step, but that the shelves are continually monitoring link flows for control path data as well as user data. The path monitoring is accomplished using a combination of arbiter and aggregator functions found in the service shelves and core interface cards, respectively. The arbiter transmits link test cells to both cores on a per flow basis, wherein the link test cells traverse and are monitored by respective aggregators to and from each core. When an egress arbiter determines that a flow is bad, it initiates a switch to the alternative source core, from which the flow would continue.
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Hoch Thomas A
Jones John Patrick
Long Andrew A
Palnati Prasasth R
Parker Ronald M
Elallam Ahmed
Hodulik Matthew J.
Lucent Technologies - Inc.
Nguyen Hanh
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