Protection network design
US5734640A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1996 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Feb 28, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/0016
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communications network protection design method notionally adds a spare to the network for a simulated span failure and the respective values for network restorability merit, (taking into account span length or cost) are calculated. The notionally added spare having the greatest value of restorability merit is added to the network design and the process repeated, being extended to add two spares at a time if need be, and finally to add a complete path of spares to restore a failed span. The process ends after any addition of a spare or spares for which a network restorability target is reached. Following this forward synthesis phase, a tightening phase reduces the network cost by trying to remove spares and checking whether the restorability target can still be met. When no further single spares can be removed without violating the restorability target, this phase proceeds through various combinations namely; removing one spare and adding one spare; removing two spares and adding one or two spares; and removing three spares and adding two or three spares. Each such combination is accepted only if it will reduce the network cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.