Device and method for synchronizing system frequency in packet transport network
A packet transmission network and system frequency technology, applied in the field of system frequency synchronization devices, can solve problems such as failure to achieve hierarchy, rapid synchronization, inability to realize hierarchical data service packet forwarding and smooth transition, etc.
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[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0042] see figure 1 As shown, the embodiment of the present invention provides a system frequency synchronization device in a packet transmission network, including an external clock input circuit, a PLL (Phase-Locked Loop, phase-locked loop) circuit, an FPGA (Field-Programmable Gate Array, field programmable gate array) processing module, clock synthesis circuit, microcomputer processor, synchronization status byte extraction module, synchronization status byte generation module, packet transmission network service disk, high stability crystal oscillator, clock distribution circuit, HDB3 (High Density Bipolar of order 3code, third-order high-density bipolar code) encoding module and external clock output circuit, the microcomputer processor is respectively connected with the FPGA processing module, the clock synthesis circuit, and th...
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