Method and apparatus for switch core health monitoring and redundancy
US6798740B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2000 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Mar 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus selecting between primary switching fabric in an asynchronous transfer mode (ATM) network includes a Tap Mux controller that monitors the signals being transmitted to each of four fabric access devices. As each of the fabric access devices receives nine communication lines, the Tap Mux controller monitors a total for 36 communication lines on the primary switching fabric. Because the switching fabric is completely redundant, however, the Tap Mux controller also monitors a total of 36 communication lines on the protection switching fabric. The Tap Mux controller, therefore, includes logic that defines 72 state machines that each monitor one of the 72 lines. Each state machine, in the described embodiment, initiates a defined length time window and counts errors therein. Protection path switching occurs, for example, only when 10 errors occur on any one of the 36 primary switching fabric lines being received by four fabric access devices therein within a 100 millisecond window initiated at the detection of the first error on the communication line. If 10 errors are not detected within a defined communication window, in the described embodiment, the window is te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.