OLT MAC module for efficiently processing OAM frames
US9621970B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2012 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | Sep 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0083
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present disclosure provide efficient solutions for detecting and transmitting heartbeat frames at an optical line terminal (OLT) of an Ethernet passive optical network (EPON). The processing burden of a host CPU is reduced by shifting some of the processing responsibilities of the host CPU to an embedded CPU. An OAM capture FIFO buffer stores frames for later processing by the embedded CPU, and fields of an OAM vector register are changed whenever a heartbeat frame is detected for an LLID. Embedded CPU polls the OAM vector at a predetermined rate sufficient to maintain link status, so heartbeat messages are not missed even when the OAM capture FIFO buffer overflows. Additionally, an OAM generation buffer efficiently creates new heartbeat messages to be sent to ONUs for each supported LLID by modifying previously transmitted OAM frames with new information specific to the LLIDs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.