Redundant state machines in network elements
US7213167B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25069
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A mechanism for providing one or more passive state machines behaving in the same manner as an active state machine so that one of the passive machines will take over operation from the active machine if the active machine becomes inoperative. The active machine, in addition to responding to each excitation, sends the same excitation to a first passive machine, which accumulates the excitations and waits until the expiration of a first time T1 to “pseudo” respond to the excitation. That is, the first passive machine responds to excitations as does the active machine, but its responses are discarded. Similarly, the first passive machine, upon each pseudo-execution, sends the same excitation to a second passive machine, which accumulates the excitations and waits until the expiration of a second time T2 to pseudo respond to the excitation; and the second passive machine, upon each pseudo-execution, sends the same excitation to a third passive machine, which accumulates the excitations and waits until the expiration of a third time T3 to pseudo respond to the excitation, and so on.When an active machine becomes inoperative, another mechanism replaces the active machine with a passive …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.