Multi-CES channel transmit queue dynamic adjusting method in PTN

Abstract

A multi-CES channel transmit queue dynamic adjusting method in PTN is provided; the method comprises the following steps: using FPGA to realize a mutually associated table; allowing software to inform FPGA through a FPGA dwell vessel when a user uses the CES function of certain TDM channel; searching the first table item with the value as ff in a sequence table, and changing the value as x; allowing the FPGA to set a flag (x)=1 after a CES #x channel forms a CES package; determining whether i or i-1 are locked or not; checking whether a CES channel has a CES package to transmit or not, wherein the occurrence order of said CES channel is ranked before the CES#x in the sequence table; if not, exchanging the transmit orders of the CES #x packet flow and the CES#y packet flow. The multi-CES channel transmit queue dynamic adjusting method in PTN can effectively reduce the shaking of a receiving end recovery clock, thus helping the receiving end to restore a high quality clock.

Description

technical field [0001] The invention relates to the technical field of bearer transport network, in particular to a method for dynamically adjusting transmission queues of multiple CES channels in a packet transport network (PTN). Background technique [0002] PTN is a new generation of packet-based, connection-oriented multi-service unified transmission technology. It transforms the traditional packet network without connection and weak control into a connection-based, predictable and controllable network suitable for transmission, and integrates statistical complexity. Packet network features such as usability, good flexibility and scalability, and traditional transmission network features such as connection-oriented, end-to-end OAM and QoS, 50ms network protection switching, and timing synchronization. Circuit emulation CES (Circuit Emulation Service) is a key technology in PTN, used to transmit TDM business in PTN. CES splits TDM services as serial data streams, adds MP...

AI Technical Summary

Problems solved by technology

In the fourth round of packet sending, the CES9-4 ​​packet of the CES#9 channel arrives before the packets of other CES channels, and the polling mechanism will send the CES9-4 ​​packet of CES#9 first, so that in the fourth round, the CES#9 channel The sending order of the system changes sharply from the last to the first, and the packet sending interval will decrease sharply from ΔT to ΔT1 (ΔT>>ΔT1), which will cause a relatively large jitter in the clock recovery of the receiving end

At the same time, CES#0-CES#8 will have a small increase in the packet sending interval in the fourth round of sending packets, and will also generate clock jitter at the receiving end

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