Method for calculating report length of uplink queue with ONU

Abstract

The invention discloses a method for calculating the report length of an uplink queue with an ONU (optical network unit). The method comprises the following steps: an ONU creates an inlet packet length queue and an outlet packet length queue for each uplink queue, and the inlet packet length queue and the outlet packet length queue are stored at an SRAM and a DRAM respectively; when a new uplink data packet is added to each uplink queue of the ONU, the length of the uplink data packet is recorded in an inlet packet length queue corresponding to the uplink queue; when the length of data stored in the inlet packet length queue reaches Unit_dram, the data with the length of Unit_dram is stored in an outlet packet length queue corresponding to the uplink queue; the ONU creates n report queues for each uplink queue, and the n report queues are stored in the SRAM in an ONU chip. According to the method, only partial storage space of the SRAM needs to be occupied, the storage space of the DRAM is fully utilized, and the method has the advantages of high read-write speed and high efficiency.

Description

technical field [0001] The invention relates to a method for forming a report (report message) message in an EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network) network. Background technique [0002] EPON network is a point-to-multipoint network, an OLT (Optical Line Terminal, optical fiber line terminal) connects multiple ONUs (Optical Network Unit, optical network unit) through optical fiber and POS (Passive Optical Splitter, passive optical splitter) . The communication direction from ONU to OLT is the upstream direction. Each ONU in the EPON network sends a report message to the OLT to report the upstream communication requirements, and the OLT sends a gate (gate message) message to each ONU to allocate upstream bandwidth or upstream for each ONU. transmission time. [0003] Each ONU has multiple upstream queues, and each upstream queue is arranged with multiple upstream data packets according to a FIFO (first in first out, first in first out) pri...

AI Technical Summary

Problems solved by technology

It is undoubtedly the most convenient and fast to store the length of each uplink data packet in the SRAM, but the storage space of the SRAM is limited, and if a large amount of data needs to be stored, the SRAM will occupy a large chip area

However, storing the length of each uplink data packet in the DRAM requires a huge bandwidth of the DRAM, and the delay of the DRAM will cause insufficient calculation efficiency.

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