Method for fast recovery from ring protection switches on DOCSIS networks
US7885182B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2005 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Mar 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L41/0654
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The range delay of each of a plurality of user devices of an HFC is monitored. If the delay of a number of devices shifts by about the same amount and at about the same time, then the number of devices having such a shift is compared to a predetermined threshold. If the number exceeds the threshold, it is assumed that a leg of a fiber ring in the HFC has been severed, and a ring switch is determined to have occurred.Upon this determination, granting of bandwidth requests to a group of user devices is suspended, and a ranging and register process for all devices in the group begins. The group may comprise all user devices affected by the broken fiber ring. Following ranging and registering, granting of bandwidth requests to the affected devices begins according to a normally-provisioned request grant schedule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.