High-speed message obtaining method and system based on PON delay distance

Abstract

The invention discloses a high-speed message obtaining method and system based on a PON delay distance. The method comprises the steps that (1) when ONUs in a PON system send serial uplink optical signals to OLTs and the OLTs send serial downlink optical signals to the ONUs, the serial uplink optical signals and the serial downlink optical signals are respectively converted into parallel electric signals and then output the signals; (2) the output parallel electric signals are collected in real time, uplink data and downlink data are respectively output to a physical layer for encoding, and the data are converted into the serial optical signals and then respectively send to the corresponding OLTs or ONUs, and meanwhile collected uplink data and the downlink data are copied and forwarded. The system comprises a signal conversion module for signal conversion, and a data message processing module for data copying and forwarding. The method has the advantages of being simple, high in stability, high in data processing performance, small in resource consumption and capable of achieving high-speed data messages obtaining, meanwhile lengthening the data transmission distance, and not affecting normal communication of optical fiber lines.

Description

Technical field [0001] The present invention relates to passive optical network technology, in particular to a method and system for obtaining high-speed messages based on PON delay. Background technique [0002] The PON (Passive Optical Network) system includes multiple optical network units (ONU, Optical Network Unit) as PON terminal equipment, and optical line terminals (OLT, Optical Line Terminal) as PON central office equipment. ONU and OLT are connected through an optical fiber network. PON medium delay and message acquisition technology is an important technology in passive optical network monitoring technology, which is widely used in distributed real-time control systems, network fault analysis, intrusion detection systems, network monitoring systems, computer forensics systems, etc. field. The extension technology is a technology that increases the transmission distance without affecting data distortion; the message acquisition technology is to copy the data into the ...

AI Technical Summary

Problems solved by technology

In terms of data copying, due to the limitation of the acceptance capacity of the network card itself and the delay caused by the upper layer logic for data processing, the process of copying network data from the network card to the memory and then copying to the data buffer will result in the loss of the data buffer for storing and obtaining messages. In addition, copying data from the kernel state to the user state consumes a lot of CPU resources, which affects the overall performance of the system

For example, in the process of traditional Libpcap capturing packets from the network card to the application program, the data packet needs to be copied three times, and these three copies need to consume a lot of resources.

In terms of kernel interrupt processing, if the flow rate reaches hundreds of thousands of pps per second, the peak value can reach hundreds of thousands or millions of pps data packets, and an interrupt will be generated every time a packet is sent. On-site processing and switching contexts need to consume at least three CPU cycle systems on average, and the resource consumption is too large for the packet capture platform

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