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System time synchronization device and method in packet transport network

A technology for transmitting network and system time in packets, which is applied in the direction of synchronization devices, transmission systems, digital transmission systems, etc., and can solve problems affecting the accuracy of time synchronization

Active Publication Date: 2013-01-09
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] With the development of network data IP multi-services, the requirements for time synchronization are getting higher and higher. The current time synchronization technology uses software time stamping, and there are uncertain factors such as operating system process scheduling and jitter delay, which affect time synchronization. the accuracy of

Method used

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Embodiment Construction

[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] see figure 1 As shown, the embodiment of the present invention provides a system time synchronization device in a packet transmission network, including a CPU, a time synchronization module, an FPGA (Field-Programmable Gate Array, Field Programmable Gate Array), 1PPS+TOD (1Pulse Per Second+ Time of Day, second pulse day time) time interface, entrance time stamp module, exit time stamp module, first PTP port, second PTP port, FPGA is connected to CPU through time synchronization module, first PTP port through entrance time stamp module It is connected to the CPU, the second PTP port is connected to the CPU through the export time stamp module, and the FPGA is also connected to the CPU and the 1PPS+TOD time interface respectively.

[0058] The first PTP port is used to: receive a data packet from an external network, identify a ...

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Abstract

The invention discloses a system time synchronization device and method in a packet transport network, relating to packet transport networks in optical communication. The device comprises a CPU (central processing unit), a time synchronization module, an FPGA (field-programmable gate array), a 1PPS+TOD (1pulse per second+time of day) time interface, an entry time stamp module, an exit time stamp module, a first PTP (precision time protocol) port and a second PTP port, wherein the FPGA is connected with the CPU through the time synchronization module; the first PTP port is connected with the CPU through the entry time stamp module; the second PTP port is connected with the CPU through the exit time stamp module; and the FPGA is also respectively connected with the CPU and the 1PPS+TOD time interface. The device and the method have the following advantages: through combination of software and hardware, nanosecond precision system time synchronization between master and slave stations in the packet transport network can be effectively and quickly implemented, and high precision timing of the whole network can be implemented.

Description

technical field [0001] The invention relates to a packet transmission network in optical communication, in particular to a system time synchronization device and method in the packet transmission network. Background technique [0002] With the application and popularization of 3G / 4G services, the business is developing towards IP (Internet Protocol, a protocol for interconnecting networks) multi-services. The packet transport network is a transport network with packets as the core, replacing MSTP (Multi-Service Transfer Platform, SDH-based multi-service transport platform) network has become the mainstream transport bearer network. The packet transmission network not only needs to be compatible with the frequency synchronization of the traditional SDH (Synchronous Digital Hierarchy, Synchronous Digital Series) network, but also puts forward higher precision and more accurate timing requirements for time synchronization. Time synchronization is CDMA (Code Division Multiple A...

Claims

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Application Information

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IPC IPC(8): H04L7/00
CPCH04L69/28H04J3/0697H04L69/12
Inventor 朱冬艳章灿辉林雪袁卫军计世荣吴海波
Owner FENGHUO COMM SCI & TECH CO LTD
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