Ethernet data and multi-channel E1 data processing method and system

Abstract

The invention discloses an Ethernet data and multi-channel E1 data processing method and system. The positions of receiving and sending timestamps of PTP (Precision Time Synchronization Protocol) event messages are located at E1 interfaces, and the influence that as the circuit time delay change is brought by uncertain time delay in the protocol conversion process of the Ethernet and the E1, the time service precision of the PTP is reduced is eliminated; the Ethernet messages of the Ethernet interface and the multiple E1 interfaces are interacted through a port VLAN mark, not only is bandwidth utilization ratio of the Ethernet interface improved, but also the effective bandwidth of an E1 link circuit is improved, the application requirements meeting multi-node long-distance time synchronous system network creation are realized, and the technical effects of optimizing and simplifying systems design, reducing adverse factors of time service precision, improving time service precision and meeting application requirements of multiple E1 interface time service are achieved.

Description

technical field [0001] The invention relates to the field of communication network research, in particular to a method and system for processing Ethernet data and multi-channel E1 data. Background technique [0002] As the most widely used communication network, Ethernet has become the main development direction of the communication bearer network due to its superior cost performance, high technology maturity and high transmission rate. With the development of the network, profound changes have taken place in the networking form, service type and application occasions of the network. In the process of Ethernet moving towards network convergence, the normal operation of many services requires accurate clock synchronization. Therefore, the clock The need for synchronization puts higher and higher demands on it. For example, in 3G and 4G mobile communication networks, not only frequency synchronization is required between base stations, but also time synchronization is becomin...

AI Technical Summary

Problems solved by technology

[0009] Existing technology 1 needs to accurately calculate the time delay of the PTP data message in the co-conversion process, and correct the time delay into the message data. The main disadvantages of this processing method are: the error caused by the time delay calculation process It will affect the improvement of PTP timing accuracy; due to the large bandwidth of the Ethernet data port and the small bandwidth of the E1 port, it is necessary to cache the data received by the Ethernet port, which will not only increase the difficulty of calculating the delay of each frame of data packets, but also require Correctly match the delay data of each frame of data, which brings the risk of message data processing, and does not take advantage of the improvement of PTP timing accuracy

[0011] In the prior art two, the above-mentioned multi-E1 / PTP time channel adapter proposes a method for mapping and demapping data between the Ethernet PTP interface and the multi-E1 interface, which optimizes the number of equipment configurations under the PTP application occasion of the multi-E1 port, but its The implementation method and mechanism have the following problems: the synchronization (Sync) message and the follow (Follow_Up) message received by the Ethernet (PTP) are broadcast to each E1 interface, which is suitable for the application of PTP messages in multicast mode ; But in unicast mode, broadcasting these two messages will cause a large amount of redundant data to be transmitted on other E1 lines, occupying the E1 line bandwidth and reducing the utilization rate of E1 lines; The mapping relationship between the MAC address (hardware address of the sub-time server) obtained in the article and the E1 interface number is used to forward the request response (Delay_Resp) message received by the Ethernet (PTP) in a directional manner, which is suitable for unicast mode The application of PTP; for the multicast mode, the source MAC address of the request (Delay_Req) ​​message is a multicast address, which is not suitable for such a processing method; the time delay of the message in the adapter is calculated and corrected to the message data The method in will bring errors in the delay calculation process and does not take advantage of the improvement of system timing accuracy

[0022] Using the method of calculating the time delay during the adaptation process between Ethernet and E1 will cause calculation errors due to factors such as the frequency difference of the time delay calculation clock during the time delay calculation process, which is not conducive to the improvement of the system timing accuracy

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