Device and method for synchronizing system frequency in packet transport network

Abstract

The invention discloses a device and a method for synchronizing system frequency in a packet transport network, and relates to a packet transport network in optical communication. The system frequency synchronizing device comprises a microcomputer processor, a field programmable gate array (FPGA) processing module, a clock integrated circuit, a packet transport network service disk, a synchronous state byte extracting module, a synchronous state byte generating module, a phase locked loop circuit, an external clock input circuit, a high stable crystal oscillator, a clock distributing circuit, a HDB3 coding module and an external clock output circuit, wherein the FPGA processing module comprises a preceding stage preselector, a priority level control module, a first selector, a second selector and a third selector. By the device and method, the system frequency in the whole packet transport network can be synchronized rapidly, data business package transmission and smooth transition can be carried out rapidly and hierarchically, and the device is flexible and has high reliability.

Description

technical field [0001] The invention relates to a packet transmission network in optical communication, in particular to a system frequency synchronization device and method in the packet transmission network. Background technique [0002] With the IP (Internet Protocol, the interconnection protocol between networks) of more and more services, in the multi-service information age where video services, multimedia services, and traditional services develop together, high-speed, large-capacity digital information highways are being We are building and influencing the way we live. The packet transport network is a transport network with packet as the core and a platform that supports multi-service transport. New services put forward high requirements on the synchronization performance of the network. In addition, during the development of the communication network from circuit switching to packet switching, the compatibility of traditional TDM (Time Division Multiplex, time div...

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Problems solved by technology

[0004] With the advancement of packet data transmission technology, the fast forwarding and smooth transition of data service packets have higher and higher requirements for frequency synchronization. Although the frequency synchronization of the existing technology can achieve the synchronization level, it is still not up to the hierarchical and fast To achieve synchronization requirements, it is impossible to achieve faster and hierarchical data service packet forwarding and smooth transition

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