公开(公告)号：US20140093239A1

公开(公告)日：2014-04-03

申请号：US13630425

申请日：2012-09-28

Applicant: BROADCOM CORPORATION

Inventor： Mark GRISWOLD ,  Lawrence Drew Davis ,  Mitchell McGee

IPC: H04J14/00

CPC classification number: H04Q11/0067 ,  H04Q2011/0083

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.

Abstract translation: 本公开的实施例提供了用于在以太网无源光网络（EPON）的光线路终端（OLT）处检测和发送心跳帧的有效解决方案。 主机CPU的处理负担通过将主机CPU的一些处理职责转移到嵌入式CPU来减少。 OAM捕获FIFO缓冲器存储帧以供嵌入式CPU稍后处理，并且每当为LLID检测到心跳帧时，OAM向量寄存器的字段将被更改。 嵌入式CPU以足以维持链路状态的预定速率轮询OAM向量，因此即使OAM捕获FIFO缓冲区溢出也不会丢失心跳消息。 另外，OAM生成缓冲器通过使用特定于LLID的新信息修改先前发送的OAM帧，有效地创建新的心跳消息，以将其发送到每个支持的LLID的ONU。