Method of group transmission Ethernet passive light notwork upgoing chain circuit data

Abstract

This invention relates to an up link data packet transmission method of an Ethernet passive light network, in which, an ONU process includes: judging if a data packet on a logic channel is needed to be split and if the logic channel is at the slice state and generating an intermediate slice data packet, a head slice data packet, a tail slice data packet or a complete data packet data packet, the OLT process includes: judging if the logic channel buffer storage is at the slice state, if the data packet is a complete packet and receiving the complete and incomplete data packets of the slice state, the complete and incomplete data packets of non-slice state to realize the maximum usability of links.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to the field of Ethernet passive optical network (EPON), and specifically refers to a method for transmitting data packets in the uplink of the Ethernet passive optical network. Background technique [0002] In the current common EPON systems and products, the uplink adopts time-division multiplexing access mode, and each ONU uses the transmission window (TransmissionWindow) , sending the upstream data packets (or data frames, Data Frame, including Ethernet protocol packets or Ethernet frames, EthernetFrame) to the OLT. [0003] The length of the Ethernet protocol packet is variable (or not fixed, usually ranging from 64 bytes to 1518 bytes), and the Ethernet service itself also has a certain burstiness, while the bandwidth defined in the 802.3ah protocol The length of the authorization is also variable, and there is no split (or segmentation) for the Ethernet protocol pa...

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Problems solved by technology

[0003] The length of the Ethernet protocol packet is variable (or not fixed, usually ranging from 64 bytes to 1518 bytes), and the Ethernet service itself also has a certain burstiness, while the bandwidth defined in the 802.3ah protocol The length of the authorization is also variable, and there is no split (or segmentation) for the Ethernet protocol packets sent by the ONU, so the transmission of the uplink Ethernet protocol packets is usually combined, that is, the ONU continuously bursts within a sending window. Send multiple Ethernet protocol packets, and each Ethernet protocol packet is continuous and complete. This implementation method is undoubtedly the simplest, but it also brings a serious problem: the uplink transmission efficiency is greatly affected. Influence, or the bandwidth utilization of Ethernet protocol packet transmission is low

Because in a sending window, it is impossible for the sum of the lengths of all sent Ethernet protocol packets to be exactly equal to the length of the sending window, if the remaining part of the current sending window is not enough to transmit the next Ethernet protocol packet to be sent, or the current sending window " If the "remaining length" is less than the length of the next Ethernet protocol packet to be sent, the Ethernet protocol packet can only wait for the next sending window. Obviously, this "remaining length" is completely wasted. In the worst case, each sending window will Waste the length of an Ethernet protocol packet, even the maximum length of the Ethernet protocol packet (that is, the maximum transmission unit MTU: Maximal Transmit Unit, usually 1MTU=1518 bytes), obviously this is very important for the transmission of the EPON uplink Ethernet protocol packet Unfavorable, it also affects the working performance and network service quality of EPON system, which limits the wide application of EPON

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