Method, module and converter for precise delay calculation of E1/Ethernet protocol conversion
A protocol converter and delay calculation technology, which is applied in the field of data transmission, can solve the problems of no consideration of delay change, delay jitter, clock master clock time deviation can not reach the microsecond level, etc., to achieve low cost and less investment Effect
Inactive Publication Date: 2012-12-19
GZH BEIDOU TECH GRP
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[0025] 2) Processing time delay of SDH network elements for signal buffering and encapsulation
[0028] Now the protocol converter only converts the Ethernet protocol code stream and the E1 protocol code stream format, and the delay change caused by the conversion is not considered at all, which will cause millisecond-level jitter in the path delay, which is very important for high-precision time Synchronization is a very big problem, which will lead to non-convergence in the calculation of path delay and time deviation, and the time deviation of the slave clock relative to the master clock cannot reach the microsecond level
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[0063] A kind of E1 / Ethernet protocol conversion accurate delay calculation method of the present invention, described method is specifically as follows:
[0064] 1.1 Realize the initial configuration of the Ethernet transceiver;
[0065] 1.2 Realize receiving the data sent by the PTP device on the Ethernet from the Ethernet transceiver, performing format conversion, and sending the E1 transceiver according to the E1 line mode configured by the device, and finally sending it to the E1 line;
[0066] 1.3 Receive the data on the E1 line from the E1 transceiver, perform format conversion, send it to the Ethernet transceiver, and finally send it to the PTP device in the Ethernet;
[0067] 1.4 Accurately calculate the processing time from receiving the Ethernet transceiver data to sending to the E1 transceiver in the functional step 1.2, and add it to the corresponding area of the PTP protocol;
[0068] 1.5 Accurately calculate the processing time from receiving the E1 transceiv...
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The invention relates to a method, a module and a converter for a precise delay calculation of an E1 / Ethernet protocol conversion; the precise delay calculation comprises the following steps of: 1, calculating delay time for Ethernet receiving data to E1 sending data, wherein a starting point of the whole calculation delay time is a moment for receiving the Ethernet data and a stopping point is the moment for sending the E1 data; 2, calculating the delay time for the E1 data to the Ethernet sending data, wherein the starting point of the whole calculation delay time is the moment for receiving the E1 data and the stopping point is the moment for sending the Ethernet data; and 3, recording the delay time in a data package. The technical scheme provided by the invention is an important link in a SDH (Synchronous Digital Hierarchy) ground time synchronous system and a foundation for realizing the ground time synchronous network.
Description
[0001] Technical field: [0002] The invention belongs to the field of data transmission, and relates to a protocol conversion technology for carrying PTP on an E1 channel, in particular to an accurate time delay calculation method for E1 / Ethernet protocol conversion, a module, a converter and a method for using the converter. [0003] Background technique [0004] To transmit the PTP message carried by Ethernet on SDH, the format of the Ethernet message and the format of the user interface E1 of SDH must be converted first. Since the previous conversion only considered the service conversion, the delay change caused by the service conversion No attention. For constructing a high-precision time synchronization network based on SDH, the delay variation caused by protocol conversion must be resolved first. [0005] 1) The status and trend of foreign development: [0006] In 1988, the International Radio Consultative Committee (CCIR), the predecessor of ITU-R, clearly stated...
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IPC IPC(8): H04J3/06H04L29/06
Inventor 杜光耀王宝峰
Owner GZH BEIDOU TECH GRP