A dynamic adjustment method for sending queues of multiple ces channels in ptn

Abstract

A method for dynamically adjusting the transmission queues of multiple CES channels in a PTN. FPGAs are used to implement interrelated tables. When the user enables the CES function of a certain TDM channel, the software will notify the FPGA through the FPGA register, and at the same time find the sequence table. The first entry whose value is ff, change its value to x; after CES#x channel generates a CES packet, FPGA sets flag(x)=1; judge whether i or i-1 is locked; check the sequence table Whether there is a CES packet to be sent in a CES channel whose occurrence order is before CES#x, if there is no packet to be sent, the sending order of the two packet streams of CES#x and CES#y is exchanged. The invention effectively reduces the jitter of the recovered clock at the receiving end, and helps recover a high-quality clock at the receiving end.

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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